Thed van Leeuwen, PhD

Thed van Leeuwen is a senior researcher at CWTS. His research interests are in the triangular relationship of (the reform of) research evaluation, open science, and research integrity. Thed is also interested in the evaluation of research in general, and in the social sciences, law and the humanities in particular, as well in the ways research quality is perceived in research assessment contexts. The overarching science policy context under which research assessments are organized and the role of quantitative and qualitative information is dealt with are of major concern for this research agenda. Thed is co-editor of the journal Research Evaluation, published by Oxford University Press, member of the Core Team of the Research Intelligence Network Netherlands (RINN), as well as current President of the European Network of Indicator Designers (ENID, until September 2023).

Thed is a member of the Evaluation & Culture  focal area and a member of the Information & Openness focal area.

Publications

Journal publications (95)

• Colavizza, G., Costas, R., Traag, V.A., Van Eck, N.J., Van Leeuwen, T.N., & Waltman, L. (2021). A scientometric overview of CORD-19. PLoS ONE, 16(1), e0244839. (paper)
• Sixto-Costoya, A., Robinson-García, N., Van Leeuwen, T.N., & Costas, R. (2021). Exploring the relevance of ORCID as a source of study of data sharing activities at the individual-level: a methodological discussion. Scientometrics, 126, 7149-7165. doi:10.1007/s11192-021-04043-5 (paper)
• Robinson-García, N., Costas, R., & Van Leeuwen, T.N. (2020). Open Access uptake by universities worldwide, e9410 (e9410). PeerJ, 8. doi:10.7717/peerj.9410 (paper)
• Colavizza, G., Franssen, T., & Van Leeuwen, T.N. (2019). An empirical investigation of the Tribes and their Territories: are research specialisms rural and urban? Journal of Informetrics, 13(1), 105-117. (paper)
• Ellemers, N., Van Derr Toorn, J., Paunov, Y., & Van Leeuwen, T.N. (2019). The psychology of morality: A review and analysis of empirical studies published from 1940 through 2017. Personality and Social Psychology Review, 23(4), 332-366. (paper)
• Rozing, M.P., Van Leeuwen, T.N., Reitsma, P.H., Rosendaal, F.R., & Aziz, N.A. (2019). Freeloading in biomedical research. Scientometrics, 122, 47-55. (paper)
• Waaijer, C.J.F., Ommering, B.W.C., Van der Wurff, L.J., Van Leeuwen, T.N., & Dekker, F.W. (2019). Scientific activity by medical students: the relationship between academic publishing during medical school and publication careers after graduation. Perspectives on Medical Education, 8(4), 223-229. (paper)
• Martín-Martín, A., Costas, R., Van Leeuwen, T.N., & López-Cózar, E.D. (2018). Evidence of open access of scientific publications in Google Scholar: a large-scale analysis. Journal of Informetrics, 12(3), 819-841. (paper)
• Robinson-García, N., Van Leeuwen, T.N., & Rafols, I. (2018). Using altmetrics for contextualised mapping of societal impact: From hits to networks. Science and Public Policy, 45(6), 815-826. (paper)
• Van Leeuwen, T.N., Tatum, C.C., & Wouters, P. (2018). Exploring Possibilities to Use Bibliometric Data to Monitor Gold Open Access Publishing at the National Level. Journal of the Association for Information Science and Technology, 69(9), 1161-1173. (paper)
• Aksnes, D.W., Sivertsen, G., Van Leeuwen, T.N., & Wendt, K.K. (2017). Measuring the productivity of national R&D systems: challenges in cross-national comparisons of R&D input and publication output indicators. Science and Public Policy, 44(2), 246-258. (paper)
• Bruno, K., Larsen, K., & Van Leeuwen, T.N. (2017). Knowledge production at industrial research institutes: Institutional logics and struggles for relevance in the Swedish Institute for Surface Chemistry, 1980-2005. Research Evaluation, 26(4), 337-348. (paper)
• Peterse, E.F.P., Van Leeuwen, T.N., & Cleton-Jansen, A.M. (2017). In vitro studies of osteosarcoma: a researcher's perspective of quantity and quality. Journal of Bone Oncology, 7, 29-31. (paper)
• Van Leeuwen, T.N., & Wouters, P. (2017). Analysis of Publications on Journal Impact Factor Over Time, e4. Frontiers in Research Metrics and Analytics, 2. (paper)
• Diaz-Faes, A.A., Bordons, M., & Van Leeuwen, T.N. (2016). Integrating metrics to measure research performance in social sciences and humanities: The case of the Spanish CSIC. Research Evaluation, 25(4), 451-460. (paper)
• Prins, A.A.M., Costas, R., Van Leeuwen, T.N., & Wouters, P. (2016). Using Google Scholar in research evaluation of humanities and social science programs: A comparison with Web of Science data. Research Evaluation, 25(3), 264-270. (paper)
• Van Leeuwen, T.N., Van Wijk, E., & Wouters, P. (2016). Bibliometric analysis of output and impact based on CRIS data: A case study on the registered output of a Dutch university. Scientometrics, 106(1), 1-16. (paper)
• Van Welie, S.D., Van Leeuwen, T.N., Bouma, C.J., & Klaassen, A.B.M. (2016). The joint cardiovascular research profile of the university medical centres in the Netherlands. Netherlands Heart Journal, 24(5), 308-316. (paper)
• De Groot, C.J.M., Van Leeuwen, T.N., Mol, B.J., & Waltman, L. (2015). A longitudinal analysis of publications on maternal mortality. Paediatric and Perinatal Epidemiology, 29(6), 481-489. (paper)
• Wooding, S., Van Leeuwen, T.N., Parks, S., Kapur, S., & Grant, J. (2015). UK doubles its "world-leading" research in Life Sciences and Medicine in six years: Testing the claim? PLoS ONE, 10(7), e0132990. (paper)
• Aksnes, D.W., Van Leeuwen, T.N., & Sivertsen, G. (2014). The effect of booming countries on changes in the relative specialization index (RSI) on country level. Scientometrics, 101(2), 1391-1401. doi:10.1007/s11192-014-1245-3 (paper)
• Costas, R., Van Leeuwen, T.N., & Van Raan, A.F.J. (2014). Erratum to "Effects of the durability of scientific literature at the group level: Case study of chemistry research groups in the Netherlands" [Res. Policy 42 (4) (2013) 886-894]. Research Policy, 43(8), 1468-1468. doi:10.1016/j.respol.2014.04.006 (paper)
• Schneider, J.W., & Van Leeuwen, T.N. (2014). Analyzing robustness and uncertainty levels of bibliometric performance statistics supporting science policy. A case study evaluating Danish post-doc funding. Research Evaluation, 23(4), 285-297. doi:10.1093/reseval/rvu016 (paper)
• Costas, R., Van Leeuwen, T.N., & Van Raan, A.F.J. (2013). Effects of the durability of scientific literature at the group level: case study of chemistry research groups in the Netherlands. Research Policy, 42(4), 886-894. doi:10.1016/j.respol.2012.11.006 (paper)
• Levi, M.M., Sluiter, H., Van Leeuwen, T.N., Rook, M., & Peters, G. (2013). Medisch-wetenschappelijk onderzoek in Nederland. Hoge kwaliteit door samenwerking UMC's en opleidingsziekenhuizen, A6081. Nederlands Tijdschrift voor Geneeskunde, 157.
• Van Leeuwen, T.N. (2013). Bibliometric research evaluations, Web of Science and the Social Sciences and Humanities: A problematic relationship? Bibliometrie - Praxis und Forschung, 2, 1-18. (paper)
• Van Leeuwen, T.N. (2013). Publication trends in social psychology journals: A long-term bibliometric analysis. En Letra, 43(1), 9-11. doi:10.1002/ejsp.1933 (paper)
• Van Leeuwen, T.N., Costas, R., Calero-Medina, C.M., & Visser, M.S. (2013). The role of editorial material in bibliometric research performance assessments. Scientometrics, 95(2), 817-828. doi:10.1007/s11192-012-0904-5 (paper)
• Van Leeuwen, T.N., Kriegsman, L., Van Tol, J., & Schokkenbroek, J. (2013). The changing role of museums in the global scientific landscape. Journal of Scientometric Research, 2(2), 137-145. (paper)
• Waltman, L., Van Eck, N.J., Van Leeuwen, T.N., & Visser, M.S. (2013). Some modifications to the SNIP journal impact indicator. Journal of Informetrics, 7(2), 272-285. doi:10.1016/j.joi.2012.11.011 (paper)
• Calero-Medina, C.M., & Van Leeuwen, T.N. (2012). Seed journal citation network maps: A method based on network theory. Journal of the American Society for Information Science and Technology, 63(6), 1226-1234. doi:10.1002/asi.22631 (paper)
• Costas, R., & Van Leeuwen, T.N. (2012). Approaching the "reward triangle": general analysis of the presence of funding acknowledgments and "peer interactive communication" in scientific publications. Journal of the American Society for Information Science and Technology, 63(8), 1647-1661. doi:10.1002/asi.22692 (paper)
• Costas, R., Van Leeuwen, T.N., & Bordons, M. (2012). Referencing patterns of individual researchers: do top scientists rely on more extensive information sources? Journal of the American Society for Information Science and Technology, 63(12), 2433-2450. doi:10.1002/asi.22662 (paper)
• Nederhof, A.J., Van Leeuwen, T.N., & Clancy, P. (2012). Calibration of bibliometric indicators in space exploration research: a comparison of citation impact measurement of the space and ground-based life and physical sciences. Research Evaluation, 21(1), 79-85. doi:10.1093/reseval/rvr005 (paper)
• Van Leeuwen, T.N. (2012). Discussing some basic critique on Journal Impact Factors: Revision of earlier comments. Scientometrics, 92, 443-455. (paper)
• Van Leeuwen, T.N., & Calero-Medina, C.M. (2012). Redefining the field of economics: Improving field normalization for the application of bibliometric techniques in the field of economics. Research Evaluation, 21, 61-70. doi:10.1093/reseval/rvr006 (paper)
• Van Leeuwen, T.N., & Moed, H.F. (2012). Funding decisions, peer review and scientific excellence in physical sciences, chemistry and geosciences. Research Evaluation, 21(3), 189-198. doi:10.1093/reseval/rvs009 (paper)
• Waltman, L., Calero-Medina, C.M., Kosten, M.J.F., Noyons, E.C.M., Tijssen, R.J.W., Van Eck, N.J., Van Leeuwen, T.N., Van Raan, A.F.J., Visser, M.S., & Wouters, P. (2012). The Leiden Ranking 2011/2012: Data collection, indicators, and interpretation. Journal of the American Society for Information Science and Technology, 63(12), 2419-2432. doi:10.1002/asi.22708 (paper)
• Costas, R., Van Leeuwen, T.N., & Van Raan, A.F.J. (2011). The "Mendel syndrome" in science: durability of scientific literature and its effects on bibliometric analysis of individual scientists. Scientometrics, 89(1), 177-205. (paper)
• Van Eyk, H.J., Hooiveld, H.M.W., Van Leeuwen, T.N., Van der Wurff, L.J., De Craen, A.J.M., & Dekker, F.W. (2011). Scientific output of Dutch medical students. Tijdschrift voor Medisch Onderwijs, 30(3), 72-79.
• Van Raan, A.F.J., Van Leeuwen, T.N., & Visser, M.S. (2011). Non-English papers decrease rankings. , 469(7328), 34. doi:10.1038/469034a (paper)
• Van Raan, A.F.J., Van Leeuwen, T.N., & Visser, M.S. (2011). Severe language effect in university rankings: particularly Germany and France are wronged in citation-based rankings. Scientometrics, 88(2), 495-498. (paper)
• Waltman, L., Van Eck, N.J., Van Leeuwen, T.N., Visser, M.S., & Van Raan, A.F.J. (2011). On the correlation between bibliometric indicators and peer review: Reply to Opthof and Leydesdorff. Scientometrics, 88(3), 1017-1022. (paper)
• Waltman, L., Van Eck, N.J., Van Leeuwen, T.N., Visser, M.S., & Van Raan, A.F.J. (2011). Towards a new crown indicator: An empirical analysis. Scientometrics, 87(3), 467-481. (paper)
• Waltman, L., Van Eck, N.J., Van Leeuwen, T.N., Visser, M.S., & Van Raan, A.F.J. (2011). Towards a new crown indicator: Some theoretical considerations. Journal of Informetrics, 5(1), 37-47. doi:10.1016/j.joi.2010.08.001 (paper)
• Zuccala, A., & Van Leeuwen, T.N. (2011). Book Reviews in Humanities Research Evaluations. Journal of the American Society for Information Science and Technology, 62, 1979-1991. doi:10.1002/asi.21588 (paper)
• Costas, R., Van Leeuwen, T.N., & Bordons, M. (2010). A bibliometric classificatory approach for the study and assessment of research performance at the individual level: the effects of age on productivity and impact. Journal of the American Society for Information Science and Technology, 61(8), 1564-1581. doi:10.1002/asi.21348 (paper)
• Costas, R., Van Leeuwen, T.N., & Bordons, M. (2010). Self-citations at the meso and individual levels: effects of different calculation methods. Scientometrics, 82(3), 517-537. (paper)
• Costas, R., Van Leeuwen, T.N., & Van Raan, A.F.J. (2010). Is scientific literature subject to a 'sell-by-date'? : A general methodology to analyze the 'durability' of scientific documents. Journal of the American Society for Information Science and Technology, 61(2), 329-339. doi:10.1002/asi.21244 (paper)
• Nederhof, A.J., Van Leeuwen, T.N., & Van Raan, A.F.J. (2010). Highly cited non-journal publications in political science, economics and psychology: a first exploration. Scientometrics, 83(2), 363-374. doi:10.1007/s11192-009-0086-y (paper)
• Van der Velde, A.E., Van Leeuwen, T.N., Van Welie, S.D., Stam, J.C.G., & Klaassen, A.B.M. (2010). De kwaliteit van het cardiovasculair wetenschappelijk onderzoek in Nederland: De toegevoegde waarde van de Nederlandse Hartstichting, A803. Nederlands Tijdschrift voor Geneeskunde, 154.
• Van Eyk, H.J., Hooiveld, M.H.W., Van Leeuwen, T.N., Van der Wurff, L.J., De Craen, A.J.M., & Dekker, F.W. (2010). Scientific output of Dutch medical students. Medical Teacher, 32(3), 231-235. doi:10.3109/01421591003596592 (paper)
• Van Raan, A.F.J., Van Leeuwen, T.N., Visser, M.S., Van Eck, N.J., & Waltman, L. (2010). Rivals for the crown: Reply to Opthof and Leydesdorff. Journal of Informetrics, 4(3), 431-435. doi:10.1016/j.joi.2010.03.008 (paper)
• Costas, R., Bordons, M., Van Leeuwen, T.N., & Van Raan, A.F.J. (2009). Scaling rules in the science system: influence of field-specific citation characteristics on the impact of individual researchers. Journal of the American Society for Information Science and Technology, 60(4), 740-753. doi:10.1002/asi.21017 (paper)
• Tijssen, R.J.W., Van Leeuwen, T.N., & Van Wijk, E. (2009). Benchmarking university-industry research cooperation worldwide: performance measurements and indicators based on co-authorship data for the world's largest universities. Research Evaluation, 18(1), 13-24. doi:10.3152/095820209X393145 (paper)
• Van Leeuwen, T.N. (2009). Strength and weakness of national science systems: A bibliometric analysis through cooperation patterns. Scientometrics, 79(2), 389-408. doi:10.1007/s11192-009-0426-y (paper)
• Van Leeuwen, T.N. (2009). Using bibliometrics to support the procurement of NIHR biomedical research centres in England. Research Evaluation, 18(1), 71-82. doi:10.3152/095820209X414178 (paper)
• Lambers Heerspink, H.J., Knol, M.J., Tijssen, R.J.W., Van Leeuwen, T.N., Grobbee, D.E., & De Zeeuw, D. (2008). Is the randomised controlled drug trial in Europe lagging behind the US? British Journal of Clinical Pharmacology, 66, 774-790. doi:10.1111/j.1365-2125.2008.03296.x (paper)
• Van Leeuwen, T.N. (2008). Testing the validity of the Hirsch-index for research assessment purposes. Research Evaluation, 17(2), 157-160. doi:10.3152/095820208X319175 (paper)
• Calero-Medina, C.M., Van Leeuwen, T.N., & Tijssen, R.J.W. (2007). Research cooperation within the bio-pharmaceutical industry: Network analyses of co-publications within and between firms. Scientometrics, 71(1), 87-99. doi:10.1007/s11192-007-1650-y (paper)
• Van Leeuwen, T.N. (2007). Modelling of bibliometric approaches and importance of output verification in research performance assessment. Research Evaluation, 16(2), 93-105. doi:10.3152/095820207X227529 (paper)
• Van Leeuwen, T.N. (2007). The application of bibliometric analyses in the evaluation of social science research. Who benefits from it, and why it is still feasible. Scientometrics, 66, 133-154. doi:10.1007/s11192-006-0010-7 (paper)
• Van Leeuwen, T.N., Van der Wurff, L.J., & De Craen, A.J.M. (2007). Classification of research letters in general medical journals and its consequences in bibliometric research evaluation procresses. Research Evaluation, 16, 59-63. doi:10.3152/095820207X196786 (paper)
• Tijssen, R.J.W., & Van Leeuwen, T.N. (2006). Measuring impacts of academic science on industrial research: A citation-based approach. Scientometrics, 66, 55-69. doi:10.1007/s11192-006-0005-4 (paper)
• Tijssen, R.J.W., Mouton, J., Van Leeuwen, T.N., & Boshoff, N. (2006). How relevant are local scholarly journals in global science? A case study of South Africa. Research Evaluation, 15(3), 163-174. doi:10.3152/147154406781775904 (paper)
• Van Looy, B., Debackere, K., Callaert, C., Tijssen, R.J.W., & Van Leeuwen, T.N. (2006). Scientific capabilities and technological performance of national innovation systems: An exploration of emerging industrial relevant research domains. Scientometrics, 66, 295-310. doi:10.1007/s11192-006-0030-3 (paper)
• Van Leeuwen, T.N., & Moed, H.F. (2005). Characteristics of Journal Impact Factors: The effects of uncitedness and citation distribution on the understanding of journal impact factors. Scientometrics, 63, 357-371. doi:10.1007/s11192-005-0217-z (paper)
• Van Leeuwen, T.N., Visser, M.S., Moed, H.F., Nederhof, A.J., & Van Raan, A.F.J. (2003). The Holy Grail of science policy: Exploring and combining bibliometric tools in search of scientific excellence. Scientometrics, 57, 257-280. doi:10.1023/A:1024141819302 (paper)
• Van Raan, A.F.J., Visser, M.S., Van Leeuwen, T.N., & Van Wijk, E. (2003). Bibliometric analysis of : Performance assessment and position in the journal landscape. Psychotherapy Research, 13(4), 511-528. doi:10.1093/ptr/kpg038 (paper)
• Rinia, E.J., Van Leeuwen, T.N., & Van Raan, A.F.J. (2002). Impact measures of inderdisciplinary research in physics. Scientometrics, 53(2), 241-248. doi:10.1023/A:1014856625623 (paper)
• Rinia, E.J., Van Leeuwen, T.N., Bruins, E.E.W., Van Vuren, H.G., & Van Raan, A.F.J. (2002). Measuring knowledge transfer between fields of science. Scientometrics, 54(3), 347-362. doi:10.1023/A:1016078331752 (paper)
• Tijssen, R.J.W., Visser, M.S., & Van Leeuwen, T.N. (2002). Benchmarking international scientific excellence: Are highly cited research papers an appropriate frame of reference? Scientometrics, 54(3), 381-397. doi:10.1023/A:1016082432660 (paper)
• Van Leeuwen, T.N., & Moed, H.F. (2002). Development and application of journal impact measures in the Dutch science system. Scientometrics, 53(2), 249-266. doi:10.1023/A:1014808709694 (paper)
• Van Raan, A.F.J., & Van Leeuwen, T.N. (2002). Assessment of the scientific basis of interdisciplinary, applied research. Application of bibliometric methods in Nutrition and Food Research. , 31(4), 611-632. doi:10.1016/S0048-7333(01)00129-9 (paper)
• Rinia, E.J., Van Leeuwen, T.N., Bruins, E.E.W., Van Vuren, H.G., & Van Raan, A.F.J. (2001). Citation delay in interdisciplinary knowledge exchange. Scientometrics, 51(1), 293-309. doi:10.1023/A:1010589300829 (paper)
• Rinia, E.J., Van Leeuwen, T.N., Van Vuren, H.G., & Van Raan, A.F.J. (2001). Influence of interdisciplinarity on peer-review and bibliometric evaluations in physics research. , 30(3), 357-361. doi:10.1016/S0048-7333(00)00082-2 (paper)
• Van Leeuwen, T.N., & Moed, H.F. (2001). Development and application of new journal impact measures. Cortex, 37(4), 607-610. doi:10.1016/S0010-9452(08)70607-5 (paper)
• Van Leeuwen, T.N., Moed, H.F., Tijssen, R.J.W., Visser, M.S., & Van Raan, A.F.J. (2001). Language biases in the coverage of the Science Citation Index and its consequences for international comparisons of national research performance. Scientometrics, 51(1), 335-346. doi:10.1023/A:1010549719484 (paper)
• Van Leeuwen, T.N., Van der Wurff, L.J., & Van Raan, A.F.J. (2001). The use of combined bibliometric methods in research funding policy. Research Evaluation, 10(3), 195-201. doi:10.3152/147154401781777015 (paper)
• Tijssen, R.J.W., Buter, R.K., & Van Leeuwen, T.N. (2000). Technological relevance of science: An assessment of citation linkages between patents and research papers. Scientometrics, 47(2), 389-412. doi:10.1023/A:1005603513439 (paper)
• Van Leeuwen, T.N., & Tijssen, R.J.W. (2000). Interdisciplinary dynamics of modern science: analysis of cross-disciplinary citation flows. Research Evaluation, 9(3), 183-187. doi:10.3152/147154400781777241 (paper)
• Van Leeuwen, T.N., Moed, H.F., Tijssen, R.J.W., Visser, M.S., & Van Raan, A.F.J. (2000). First evidence of serious language-bias in the use of citation analysis for the evaluation of national science systems. Research Evaluation, 9(2), 155-156. doi:10.3152/147154400781777359 (paper)
• Moed, H.F., Van Leeuwen, T.N., & Reedijk, J. (1999). Towards appropriate indicators of journal impact. Scientometrics, 46(3), 575-589. doi:10.1007/BF02459613 (paper)
• Moed, H.F., Van Leeuwen, T.N., & Visser, M.S. (1999). Trends in publication output and impact of universities in the Netherlands. Research Evaluation, 8(1), 60-67. doi:10.3152/147154499781777711 (paper)
• Moed, H.F., Van Leeuwen, T.N., & Visser, M.S. (1999). Trends in publications output and impact of universities in the Netherlands. Research Evaluation, 8(1), 60-67. doi:10.3152/147154499781777711 (paper)
• Van Leeuwen, T.N., Moed, H.F., & Reedijk, J. (1999). Critical comments on Institute for Scientific information impact factors: a sample of inorganic molecular chemistry journals. Journal of Information Science, 25(6), 489-498. doi:10.1177/016555159902500605 (paper)
• Moed, H.F., Van Leeuwen, T.N., & Reedijk, J. (1998). A new classification system to describe the ageing of scientific journals and their impact factors. Journal of Documentation, 54(4), 387-419. doi:10.1108/EUM0000000007175 (paper)
• Rinia, E.J., Van Leeuwen, T.N., Van Vuren, H.G., & Van Raan, A.F.J. (1998). Comparative analysis of a set of bibliometric indicators and central peer review criteria - Evaluation of condensed matter physics in the Netherlands. , 27(1), 95-107. doi:10.1016/S0048-7333(98)00026-2 (paper)
• Moed, H.F., & Van Leeuwen, T.N. (1996). Impact factors can mislead. , 381(6579), 186-186. doi:10.1038/381186a0 (paper)
• Moed, H.F., Van Leeuwen, T.N., & Reedijk, J. (1996). A critical analysis of the journal impact factors of Angewandte Chemie and the Journal of the American Chemical Society - Inaccuracies in published impact factors based on overall citations only. Scientometrics, 37(1), 105-116. doi:10.1007/BF02093487 (paper)
• Tijssen, R.J.W., Van Leeuwen, T.N., & Korevaar, J.C. (1996). Scientific publication activity of industry in the Netherlands. Research Evaluation, 6(2), 105-119. doi:10.1093/rev/6.2.105 (paper)
• Moed, H.F., & Van Leeuwen, T.N. (1995). Improving the accuracy of institute for scientific information's journal impact factors. Journal of the American Society for Information Science, 46(6), 461-467. doi:10.1002/(SICI)1097-4571(199507)46:6461::AID-ASI5>3.0.CO;2-G (paper)
• Moed, H.F., De Bruin, R.E., & Van Leeuwen, T.N. (1995). New bibliometric tools for the assessment of national research performance: Database description, overview of indicators and first applications. Scientometrics, 33(3), 381-422. doi:10.1007/BF02017338 (paper)
• Tijssen, R.J.W., & Van Leeuwen, T.N. (1995). On generalising scientometric journal mapping beyond ISI's journal and citation databases. Scientometrics, 33(1), 93-116. doi:10.1007/BF02020776 (paper)
• Van Leeuwen, T.N., & Tijssen, R.J.W. (1993). Assessing Multidisciplinary Area's of Science and Technology - A synthetic Bibliometric Study of Dutch Nuclear-Energy Research. Scientometrics, 26(1), 115-133.

Conference publications (40)

• De Rijcke, S., Holtrop, T.J., Kaltenbrunner, W., Zuijderwijk, J., Beaulieu, A., Franssen, T., Van Leeuwen, T.N., Mongeon, P., Tatum, C.C., Valkenburg, G., & Wouters, P. (2018). Evaluative Inquiry: Engaging research evaluation analytically and strategically. Vienna: EU Council Conference on Impact of Social Sciences and Humanities for a European Research Agenda – Valuation of SSH in mission-oriented research. In . doi:10.22163/fteval.2019.386 (paper)
• Luwel, M.J.J., Van Eck, N.J., & Van Leeuwen, T.N. (2018). The Schön case: Analyzing in-text citations to papers before and after retraction. In Proceedings of the 23rd International Conference on Science and Technology Indicators (pp. 1025-1030). (paper)
• Martín-Martín, A., Costas, R., Van Leeuwen, T.N., & Delgado López Cózar, E. (2018). Unbundling Open Access dimensions: a conceptual discussion to reduce terminology inconsistencies. In Proceedings of the 23rd International Conference on Science and Technology Indicators. (paper)
• Prins, A., Spaapen, J., Van Leeuwen, T.N., & Van den Broek-Honingh, N. (2018). QRiH: Towards a fitting system for humanities research evaluation. Vienna: Pathways to Impact of SSH research. (paper)
• Van Leeuwen, T.N., Kool, L.L., & Wijk, I. (2018). National OA mandate and its potential conflicting relationship with international scientific cooperation policies: the Dutch case. Leiden: STI Conference Proceedings. In R. Costas, T. Franssen, & A. Yegros-Yegros (Eds.). (paper)
• Van Leeuwen, T.N., Meijer, I., Yegros, A., & Costas, R. (2018). Developing indicators on Open Access by combining evidence from diverse data sources. Paris, France: Proceedings of the 2017 STI Conference. (paper)
• Yegros, A., & Van Leeuwen, T.N. (2018). Production and uptake of Open Access publications involving the private sector: the case of big pharma. In R. Costas, T. Franssen, & A. Yegros-Yegros (Eds.), Proceedings of the 23rd International Conference on Science and Technology Indicators (pp. 958-966).
• Schneider, J.W., Aagaard, K., Visser, M.S., & Van Leeuwen, T.N. (2017). Examining potential database effects in longitudinal country impact analyses using fixed journal sets: STI Conference, Paris, France.
• Robinson-García, N., Van Leeuwen, T.N., & Rafols, I. (2016). SSH & the City. A Network Approach for Tracing the Societal Contribution of the Social Sciences and Humanities for Local Development. (paper)
• Rushforth, A.D., Yegros, A., Mongeon, P., & Van Leeuwen, T.N. (2016). How does ‘undone science’ get funded? A bibliometric analysis linking Rare Diseases publications to national and European funding sources.
• Díaz-Faes, A.A., Bordons, M., Van Leeuwen, T.N., & Purificación Galindo, M. (2015). Outlining the scientific activity profile of researchers in the Social Sciences and Humanities in Spain: The case of CSIC. In Proceedings of the 15th International Conference of the International Society for Scientometrics and Informetrics (pp. 548-553). (paper)
• Van Leeuwen, T.N., Tatum, C.C., & Wouters, P. (2015). Open Access publishing and citation impact - An international study. In Proceedings of the 15th International Conference of the International Society for Scientometrics and Informetrics (pp. 1130-1141). (paper)
• Prins, A., Costas, R., Van Leeuwen, T.N., & Wouters, P. (2014). Using Google Scholar in research evaluation of social science programs, with a comparison with Web of Science data. In Proceedings of the 18th International Conference on Science and Technology Indicators (pp. 434-443).
• Prins, A., Costas, R., Van Leeuwen, T.N., & Wouters, P. (2014). Using Google Scholar in research evaluation of social science programs, with a comparison with Web of Science data. In Proceedings of the 19th International Conference on Science and Technology Indicators (pp. 434-443).
• Van Leeuwen, T.N., & Luwel, M.J.J. (2014). An in-depth analysis of papers retracted in the Web of Science. Conference paper. In Proceedings of the 19th International Conference on Science and Technology Indicators (pp. 337-344).
• Aksnes, D., Van Leeuwen, T.N., & Sivertsen, G. (2013). The effect of booming countries on changes in the Relative Specialization Index (RSI) on country level. In Proceedings of the 14th International Conference of the International Society for Scientometrics and Informetrics (pp. 654-663).
• Schneider, J.W., & Van Leeuwen, T.N. (2013). Is post-doc funding stimulating research performance? Evidence from Danish research policy! In Proceedings of the 18th International Conference on Science and Technology Indicators (pp. 352-361).
• Van Leeuwen, T.N., & Wouters, P. (2013). Analysis of journal impact factor research in time: Development of a specialty? In Proceedings of the 14th International Conference of the International Society for Scientometrics and Informetrics (pp. 66-77).
• Van Leeuwen, T.N., Van Wijk, E., & Wouters, P. (2013). Recent developments in Dutch research assessment. Scholarly activity in AAH and Law in a new perspective. In Proceedings of the 18th International Conference on Science and Technology Indicators (pp. 396-398).
• Costas, R., & Van Leeuwen, T.N. (2012). New indicators based on the 'Funding Acknowledgment' information in the Web of Science: analysis of the effect of peer review over the impact of scientific journals. In Proceedings of the 17th International Conference on Science and Technology Indicators (pp. 193-205).
• Van Leeuwen, T.N., Costas, R., Calero-Medina, C.M., & Visser, M.S. (2012). The role of editorial material in bibliometric research performance assessments. In Proceedings of the 17th International Conference on Science and Technology Indicators (pp. 511-522).
• Waltman, L., Calero-Medina, C.M., Kosten, M.J.F., Noyons, E.C.M., Tijssen, R.J.W., Van Eck, N.J., Van Leeuwen, T.N., Van Raan, A.F.J., Visser, M.S., & Wouters, P. (2012). The Leiden Ranking 2011/2012: Data collection, indicators, and interpretation. In Proceedings of the 17th International Conference on Science and Technology Indicators (pp. 791-802).
• Costas, R., Van Leeuwen, T.N., & Bordons, M. (2011). Referencing patterns among individual researchers: study of the use of scientific literature from a micro-level perspective. In E.C.M. Noyons, P. Ngulube, & J. Leta (Eds.), Proceedings of the 13th International Conference of the International Society for Scientometrics and Informetrics (pp. 163-174).
• Zuccala, A., & Van Leeuwen, T.N. (2011). Book Reviews in Humanities Research Evaluations . In Proceedings of the 13th International Conference of the International Society for Scientometrics and Informetrics.
• Zuccala, A., & Van Leeuwen, T.N. (2011). Book Reviews in Humanities Research Evaluations. In Proceedings of the 13th International Conference of the International Society for Scientometrics and Informetrics (pp. 936-941).
• Costas, R., Van Leeuwen, T.N., & Van Raan, A.F.J. (2009). Development of a general methodology for the analysis of the "durability" of scientific documents. In B. Larsen, & J. Leta (Eds.), Proceedings of the 12th International Conference of the International Society for Scientometrics and Informetrics (pp. 918-919).
• Van Leeuwen, T.N., & Calero-Medina, C.M. (2009). Redefining the Field of Economics: Improving Field Normalization for the Application of Bibliometric Techniques in the Field of Economics. In Proceedings of the 12th International Conference of the International Society for Scientometrics and Informetrics (pp. 410-420).
• Van Leeuwen, T.N., & Calero-Medina, C.M. (2009). Redefining the field of economics: Improving field normalization for the application of bibliometric techniques in the field of economics. In Proceedings of the 12th International Conference of the International Society for Scientometrics and Informetrics.
• Nederhof, A.J., Van Leeuwen, T.N., & Clancy, P. (2008). Boom or bust in space exploration research: A methodological study of bibliometric monitoring and policy implications. In J. Gorraiz, & E. Schiebel (Eds.), Excellence and Emergence. A New Challenge for the Combination of Quantitative and Qualitative Approaches (pp. 109-111).
• Tijssen, R.J.W., & Van Leeuwen, T.N. (2007). Research cooperation within Europe: Bibliometric views of geographical trends and integration processes. In Proceedings of the 11th International Conference of the International Society for Scientometrics and Informetrics (pp. 740-744).
• Van Leeuwen, T.N., & Tijssen, R.J.W. (2007). Strength and weakness of national science systems. A bibliometric analysis through cooperation patterns. In Proceedings of the 11th International Conference of the International Society for Scientometrics and Informetrics (pp. 469-479).
• Calero-Medina, C.M., Van Leeuwen, T.N., & Tijssen, R.J.W. (2005). Research networks of pharmaceutical firms: Geographical patterns of research collaboration within and between firms. In Proceedings of the 10th International Conference of the International Society for Scientometrics and Informetrics (pp. 310-315).
• Van Looy, B.K., Debackere, K., Callaert, J., Tijssen, R.J.W., & Van Leeuwen, T.N. (2004). National scientific capabilities and technological performance: An exploration of emerging industrial relevant research domains. In Proceedings of the 2004 International Conference on Science and Technology Indicators (pp. 178-188).
• Rinia, E.J., Van Leeuwen, T.N., Kouw, L.R., & Van Raan, A.F.J. (2003). Can bibliometrics contribute to the study of interdisciplinary influence: A case study of physics. In Proceedings of the 9th International Conference of the International Society for Scientometrics and Informetrics (pp. 341-349).
• Rinia, E.J., Van Leeuwen, T.N., Bruins, E.E.W., Van Vuren, H.G., & Van Raan, A.F.J. (2001). Measuring knowledge transfer between fields of science. In Proceedings of the 8th International Conference of the International Society for Scientometrics and Informetrics (pp. 597-605).
• Rinia, E.J., Van Leeuwen, T.N., Van Vuren, H.G., & Van Raan, A.F.J. (2001). Impact measures of interdisciplinary research programs in physics. In Proceedings of the 8th International Conference of the International Society for Scientometrics and Informetrics (pp. 10-11).
• Tijssen, R.J.W., Visser, M.S., & Van Leeuwen, T.N. (2001). Searching for scientific excellence: Scientometric measurements and citation analyses of national research systems. In Proceedings of the 8th International Conference of the International Society for Scientometrics and Informetrics (pp. 675-689).
• Van Leeuwen, T.N., & Moed, H.F. (2001). Overview of the development and application of journal impact measures within the dutch science system. In Proceedings of the 8th International Conference of the International Society for Scientometrics and Informetrics (pp. 19-20).
• Moed, H.F., Van Leeuwen, T.N., & Reedijk, J. (1999). Towards appropriate indicators of journal impact. In Proceedings of the 7th International Conference of the International Society for Scientometrics and Informetrics (pp. 341-354).
• Rinia, E.J., Van Vuren, H.G., Van Leeuwen, T.N., & Van Raan, A.F.J. (1997). Scientometric indicators and peer evaluations: condensed matter physics in the Netherlands. In Proceedings of the 6th International Conference of the International Society for Scientometrics and Informetrics (pp. 361-371).

Books (3)

• Tijssen, R.J.W., Van Leeuwen, T.N., Luo, Y.L., Hung, W.C., Tsai, M.H., Chang, L.D., Hsiao, Y.P., & Chen, H.L. (2003). Macro level bibliometric analysis of Taiwanese Science : Science and Technology Information Center, National Research Council of Taiwan. In (pp. 1995-2001).
• Tijssen, R.J.W., Van Leeuwen, T.N., & Van Raan, A.F.J. (2002). Mapping the scientific performance of German medical research. An international comparative bibliometric study.
• Van Leeuwen, T.N., & Van Raan, A.F.J. (2002). Wise Men’s Heritage. Bibliometric study of the research funded by the Netherlands Epilepsy Foundation (NEF) : National Epilepsy Fund. In (pp. 1981-2000).

Book chapters (5)

• Van Leeuwen, T.N. (2004). Descriptive versus evaluative bibliometrics. In H.F. Moed, W. Glänzel, & U. Schmoch (Eds.), Handbook of Quantitative Science and Technology Research: The Use of Publication and Patent Statistics in Studies of S&T Systems (pp. 373-388). Kluwer Academic Publishers.
• Van Leeuwen, T.N. (2004). Descriptive versus evaluative bibliometrics. In Handbook of Quantitative Science and Technology Research: The Use of Publication and Patent Statistics in Studies of S&T Systems (pp. 373-389).
• Van Raan, A.F.J., Van Leeuwen, T.N., & Visser, M.S. (2001). Bibliometrics – Monitoring emerging fields A bibliometric methodology for exploring interdisciplinary, 'unorthodox' fields of science. A case study of environmental medicine. In S. Maasen, & M. Winterhager (Eds.), Science Studies. Probing the Dynamics of Scientific Knowledge (pp. 87-122).
• Nederhof, A.J., Van Leeuwen, T.N., & Visser, M.S. (1999). Bibliometric profiles of academic biology research in the Netherlands, 1988-1997. Utrecht: VSNU. In M.H. Meijerink (Ed.), VSNU, Biology (pp. 141-186).
• Nederhof, A.J., Van Leeuwen, T.N., Visser, M.S., & Van der Wurff, L.J. (1999). Bibliometric profiles of academic veterinary and animal sciences research in the Netherlands. Utrecht: VSNU. In M.H. Meijerink (Ed.), VSNU, Veterinary and Animal Sciences (pp. 51-91).