Rodrigo Costas, PhD

Rodrigo Costas is a senior researcher at the Centre for Science and Technology Studies (CWTS) at Leiden University (the Netherlands). Rodrigo is also an Extraordinary Associate Professor at the Centre for Research on Evaluation, Science and Technology (CREST) of Stellenbosch University (South Africa). He holds a PhD in Library and Information Science from the CSIC in Spain. His areas of expertise include the fields of information science, scientometrics, and social media metrics. At CWTS he leads the research line in ‘altmetrics’, focused on developing new theoretical and analytical approaches to study the interactions between social media and science. Some of his other topics of research include the development of advanced scientometric studies of individual scholars and the study of funding acknowledgments as a new source of scientometric data. In addition to his research activities, Rodrigo is also involved in various European and contract research projects.

Publications

Journal publications (78)

• 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)
• Costas, R., De Rijcke, S., & Marres, N.S. (2021). “Heterogeneous couplings”: operationalizing network perspectives to study science‐society interactions through social media metrics. Journal of the Association for Information Science and Technology, 72(5), 595-610. (paper)
• El Ouahi, J., Robinson-García, N., & Costas, R. (2021). Analyzing scientific mobility and collaboration in the Middle East and North Africa. Quantitative Science Studies, 2(3), 1023-1047. (paper)
• Fang, Z., Costas, R., Tian, W.C., Wang, X.W., & Wouters, P. (2021). How is science clicked on Twitter? : Click metrics for Bitly short links to scientific publications. Journal of the Association for Information Science and Technology, 72(7), 918-932. (paper)
• Orduna-Malea, E., & Costas, R. (2021). Link-based approach to study scientific software usage: the case of VOSviewer. Scientometrics, 126(9), 8153-8186. (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)
• Costas, R., Mongeon, P., Ferreira, M.R., Van Honk, J., & Franssen, T. (2020). Large-scale identification and characterization of scholars on Twitter. Quantitative Science Studies, 1(2), 771-791. (paper)
• Fang, Z., & Costas, R. (2020). Studying the accumulation velocity of altmetric data tracked by Altmetric.com. Scientometrics, 123, 1077-1101. doi:10.1007/s11192-020-03405-9 (paper)
• Fang, Z., Costas, R., Tian, W.C., Wang, X.W., & Wouters, P. (2020). An extensive analysis of the presence of altmetric data for Web of Science publications across subject fields and research topics. Scientometrics, 124(3), 2519-2549. (paper)
• González-Valiente, C.L., Costas, R., Noyons, E.C.M., Steinerová, J., & Susol, J. (2020). Terminological (di) similarities between information management and knowledge management: a term co-occurrence analysis. Mobile Networks and Applications, 26, 336-346. doi:10.1007/s11036-020-01643-y (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)
• Robinson-García, N., Costas, R., Sugimoto, C., Larivière, V., & Nane, G.F. (2020). Task specialization across research careers, 9. eLife. doi:10.7554/elife.60586 (paper)
• Van Schalkwyk, F., Dudek, J., & Costas, R. (2020). Communities of shared interests and cognitive bridges: the case of the anti-vaccination movement on Twitter. Scientometrics, 125, 1499-1516. doi:10.1007/s11192-020-03551-0 (paper)
• Zahedi, Z., & Costas, R. (2020). Do online readerships offer useful assessment tools?: Discussion around the practical applications of Mendeley readership for scholarly assessment. Scholarly Assessment Reports, 2(1). (paper)
• Díaz-Faes, A.A., Bowman, T.D., & Costas, R. (2019). Towards a second generation of ‘social media metrics’: characterizing Twitter communities of attention around science. PLoS ONE, 14(5), e0216408. (paper)
• González-Valiente, C.L., Santos, M.L., Arencibia-Jorge, R., Noyons, E.C.M., & Costas, R. (2019). Mapping the evolution of intellectual structure in information management using author co-citation analysis. Mobile Networks and Applications. doi:10.1007%2Fs11036-019-01231-9 (paper)
• Joubert, M., & Costas, R. (2019). Getting to know science tweeters: a pilot analysis of South African twitter users tweeting about research articles. Journal of Altmetrics, 2(1), 2. (paper)
• Robinson-García, N., Sugimoto, C., Murray, D.S., Yegros, A., Larivière, V., & Costas, R. (2019). The many faces of mobility: Using bibliometric data to measure the movement of scientists. Journal of Informetrics, 13, 50-63. doi:10.1016/j.joi.2018.11.002 (paper)
• Chinchilla-Rodriguez, Z., Bu, Y., Robinson-García, N., Costas, R., & Sugimoto, C. (2018). Travel bans and scientific mobility: utility of asymmetry and affinity indexes to inform science policy. Scientometrics, 116(1), 569-590. (paper)
• Costas, R., & Franssen, T. (2018). Reflections around 'the cautionary use' of the h-index: response to Teixeira da Silva and Dobránszki. Scientometrics, 115(2), 1125-1130. (paper)
• Desrochers, N., Paul-Hus, A., Haustein, S., Costas, R., Mongeon, P., Quan-Haase, A., Bowman, T.D., Pecoskie, J., Tsou, A., & Larivière, V. (2018). Authorship, citations, acknowledgments and visibility in social media: Symbolic capital in the multifaceted reward system of science. Social Science Information, 57(2), 223-248. (paper)
• Fanelli, D., Costas, R., Fang, F.C., Casadevall, A., & Bik, E.M. (2018). Testing Hypotheses on Risk Factors for Scientific Misconduct via Matched-Control Analysis of Papers Containing Problematic Image Duplications. Science and Engineering Ethics, 25(3), 771-789. (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., Sugimoto, C., Murray, D.S., Yegros, A., Larivière, V., & Costas, R. (2018). Scientific mobility indicators in practice: international mobility profiles at the country level. Profesional de la Informacion, 27(3), 511-520. (paper)
• Ruiz-Castillo, J., & Costas, R. (2018). Individual and field citation distributions in 29 broad scientific fields. Journal of Informetrics, 12(3), 868-892. (paper)
• Zahedi, Z., & Costas, R. (2018). General discussion of data quality challenges in social media metrics: Extensive comparison of four major altmetric data aggregators. PLoS ONE, 13(5), e0197326. (paper)
• Costas, R. (2017). Towards the social media studies of science: social media metrics, present and future. Bibliotecas. Anales de Investigación, 13(1), 5-9. (paper)
• Costas, R., Perianes-Rodriguez, A., & Ruiz-Castillo, J. (2017). On the quest for currencies of science: Field "exchange rates" for citations and Mendeley readership. Aslib Journal of Information Management, 69(5), 557-575. (paper)
• Fanelli, D., Costas, R., & Ioannidis, J.P.A. (2017). Meta-assessment of bias in science. Proceedings of the National Academy of Sciences of the United States of America, 114(14), 3714-3719. (paper)
• Mongeon, P., Robinson-García, N., Jeng, W., & Costas, R. (2017). Incorporating data sharing to the reward system of science Linking DataCite records to authors in the Web of Science. Aslib Journal of Information Management, 69(5), 545-556. (paper)
• Nane, G.F., Larivière, V., & Costas, R. (2017). Predicting the age of researchers using bibliometric data. Journal of Informetrics, 11(3), 713-729. (paper)
• Paul-Hus, A., Diaz-Faes, A.A., Sainte-Marie, M., Desrochers, N., Costas, R., & Larivière, V. (2017). Beyond funding: Acknowledgement patterns in biomedical, natural and social sciences. PLoS ONE, 12(10), e0185578. (paper)
• Robinson-García, N., Costas, R., Isett, K., Melkers, J., & Hicks, D. (2017). The unbearable emptiness of tweeting - about journal articles. PLoS ONE, 12(8). (paper)
• Robinson-García, N., Mongeon, P., Jeng, W., & Costas, R. (2017). DataCite as a novel bibliometric source: Coverage, strengths and limitations. Journal of Informetrics, 11(3), 841-854. (paper)
• Schneider, J.W., & Costas, R. (2017). Identifying potential "breakthrough" publications using refined citation analyses: three related explorative approaches. Journal of the Association for Information Science and Technology, 68(3), 709-723. (paper)
• Sugimoto, C., Robinson-García, N., Murray, D.S., Yegros, A., Costas, R., & Larivière, V. (2017). Scientists have most impact when they're free to move. Nature, 550(7674), 29-31. (paper)
• Zahedi, Z., Costas, R., & Wouters, P. (2017). Mendeley readership as a filtering tool to identify highly cited publications. Journal of the Association for Information Science and Technology, 68(10), 2511-2521. (paper)
• Larivière, V., & Costas, R. (2016). How many is too many?: On the relationship between research productivity and impact. PLoS ONE, 11(9), e0162709. (paper)
• Paul-Hus, A., Desrochers, N., & Costas, R. (2016). Characterization, description, and considerations for the use of funding acknowledgement data in Web of Science. Scientometrics, 108(1), 167-182. (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)
• Costas, R., Zahedi, Z., & Wouters, P. (2015). Do altmetrics correlate with citations? Extensive comparison of altmetric indicators with citations from a multidisciplinary perspective. Journal of the Association for Information Science and Technology, 66(10), 2003-2019. (paper)
• Costas, R., Zahedi, Z., & Wouters, P. (2015). The thematic orientation of publications mentioned on social media: Large-scale disciplinary comparison of social media metrics with citations. Aslib Journal of Information Management, 67(3), 260-288. (paper)
• Diaz-Faes, A.A., Costas, R., Purificación Galindo, M., & Bordons, M. (2015). Unravelling the performance of individual scholars: Use of Canonical Biplot analysis to explore the performance of scientists by academic rank and scientific field. Journal of Informetrics, 9(4), 722-733. (paper)
• Fanelli, D., Costas, R., & Larivière, V. (2015). Misconduct policies, academic culture and career stage, not gender or pressures to publish, affect scientific integrity. PLoS ONE, 10(6), e0127556. (paper)
• Haustein, S., Costas, R., & Larivière, V. (2015). Characterizing social media metrics of scholarly papers: the effect of document properties and collaboration patterns. PLoS ONE, 10(3), e0120495. (paper)
• Morillo, F., Costas, R., & Bordons, M. (2015). How is credit given to networking centres in their publications? A case study of the Spanish CIBER research structures. Scientometrics, 103(3), 923-938. (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)
• Reijnhoudt, L., Costas, R., Noyons, E.C.M., Borner, K., & Scharnhorst, A. (2014). 'Seed plus expand': a general methodology for detecting publication oeuvres of individual researchers. Scientometrics, 101(2), 1403-1417. (paper)
• Robinson-García, N., Torres-Salinas, D., Zahedi, Z., & Costas, R. (2014). New data, new possibilities: exploring the insides of altmetric.com. Profesional de la Informacion, 23(4), 359-366. (paper)
• Robinson-García, N., Torres-Salinas, D., Zahedi, Z., & Costas, R. (2014). Nuevos datos, nuevas posibilidades: Revelando el interior de Altmetric.com (New data, new possibilities: Exploring the insides of Altmetric.com). El Profesional de la Information, 23(4), 359-366. doi:10.3145/epi.2014.jul.03 (paper)
• Ruiz-Castillo, J., & Costas, R. (2014). The skewness of scientific productivity. Journal of Informetrics, 8(4), 917-934. doi:10.1016/j.joi.2014.09.006 (paper)
• Waltman, L., & Costas, R. (2014). F1000 Recommendations as a potential new data source for research evaluation: a comparison with citations. Journal of the Association for Information Science and Technology, 65(3), 433-445. doi:10.1002/asi.23040 (paper)
• Zahedi, Z., Costas, R., & Wouters, P. (2014). How well developed are altmetrics? A cross-disciplinary analysis of the presence of 'alternative metrics' in scientific publications. Scientometrics, 101(2), 1491-1513. doi:10.1007/s11192-014-1264-0 (paper)
• Bordons, M., Aparicio, J., & Costas, R. (2013). Heterogeneity of collaboration and its relationship with research impact in a biomedical field. Scientometrics, 96(2), 443-466. doi:10.1007/s11192-012-0890-7 (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)
• 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)
• Costas, R. (2012). Influence of collaboration on the impact of publication at different levels of aggregation: analysis of Spanish research on Marine Sciences. PontodeAcesso, 5(3), 149-173. doi:10.9771/1981-6766rpa.v5i3.5521 (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)
• Costas, R., Van Leeuwen, T.N., & Van Raan, A.F.J. (2012). 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)
• Waltman, L., Costas, R., & Van Eck, N.J. (2012). Some limitations of the h Index: a commentary on Ruscio and colleagues' analysis of bibliometric indices. Measurement: Interdisciplinary Research and Perspectives, 10(3), 172-175. doi:10.1080/15366367.2012.716260 (paper)
• Costas, R., & Bordons, M. (2011). Do age and professional rank influence the order of authorship in scientific publications?: Some evidence from a micro-level perspective. Scientometrics, 88(1), 145-161. doi:10.1007/s11192-011-0368-z (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)
• 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)
• 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)
• Costas, R., Van Leeuwen, T.N., & Bordons, M. (2009). A bibliometric methodology for supporting research assessment at individual level: a classification approach. Proceedings of the International Conference of the International Society for Scientometrics and Informetrics, 2009(2), 817-828.
• Costas, R., & Bordons, M. (2008). Development of a thematic filter for the bibliometric delimitation on interdisciplinary area: the case of Marine Science. Revista Espanola de Documentacion Cientifica, 31(2), 261-272. (paper)
• Costas, R., & Bordons, M. (2008). Is g-index better than h-index? : An exploratory study at the individual level. Scientometrics, 77(2), 267-288. doi:10.1007/s11192-007-1997-0 (paper)
• Costas, R., Moreno, L., & Bordons, M. (2008). Overlapping and singularity of MEDLINE, WoS and IME for the analysis of the scientific activity of a region in Health Sciences. Revista Espanola de Documentacion Cientifica, 31(3), 327-343. (paper)
• Costas, R., & Bordons, M. (2007). A classificatory scheme for the analysis of bibliometric profiles at the micro level. Proceedings of the International Conference of the International Society for Scientometrics and Informetrics, 2007(1), 226-230. (paper)
• Costas, R., & Bordons, M. (2007). A critical view of the h-index: observations based on a practical application = Una visión crítica del índice h: algunas consideraciones derivadas de su aplicación práctica. El Profesional de la Information, 16(5), 427-432. doi:10.3145/epi.2007.sep.04 (paper)
• Costas, R., & Bordons, M. (2007). Algorithms to solve the lack of normalization in author names in bibliometric studies. Investigación Bibliotecológica, 21(42), 13-32.
• Costas, R., & Bordons, M. (2007). The h-index: advantages, limitations and its relation with other bibliometric indicators at the micro level. Journal of Informetrics, 1(3), 193-203. (paper)
• Costas, R., & Iribarren-Maestro, I. (2007). Variations in content and format of ISI databases in their different versions: the case of the Science Citation index in CD-ROM and the web of science. Scientometrics, 72(2), 167-183. doi:10.1007/s11192-007-1589-z (paper)
• Costas, R., & Bordons, M. (2005). Bibliometric indicators at the micro-level: some results in the area of natural resources at the Spanish CSIC. Research Evaluation, 14(2), 110-120. doi:10.3152/147154405781776238 (paper)
• Costas, R., & Bordons, M. (2005). Methodological procedure to overcome the lack of normalisation of author names in bibliometric analyses at the micro level. Proceedings of the International Conference of the International Society for Scientometrics and Informetrics, 2005, 688-689.

Conference publications (34)

• Costas, R., Zahedi, Z., & Alperin, J.P. (2019). Global country-level patterns of Mendeley readership performance compared to citation performance: does Mendeley provide a different picture on the impact of scientific publications across countries? In G. Catalano, C. Daraio, M. Gregori, H.F. Moed, & G. Ruocco (Eds.), Proceedings of the International Conference on Scientometrics and Informetrics (pp. 1195-1200). (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)
• 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)
• Zahedi, Z., & Costas, R. (2018). Challenges in the quality of social media data across altmetric data aggregators. In R. Costas, T. Franssen, & A. Yegros-Yegros (Eds.), Proceedings of the 23rd International Conference on Science and Technology Indicators (pp. 1553-1557). (paper)
• Costas, R., Van Honk, J., Calero-Medina, C.M., & Zahedi, Z. (2017). Discussing practical applications for altmetrics: development of ‘social media profiles’ for African, European and North American publications. (paper)
• Zahedi, Z., & Costas, R. (2017). How visible are the research of different countries: an analysis of global vs. local reach of WoS publications on Twitter. (paper)
• Costas, R., Haustein, S., Zahedi, Z., & Larivière, V. (2016). Exploring paths for the normalization of altmetrics: applying the characteristic scores and scales. (paper)
• Costas, R., Van Honk, J., Zahedi, Z., & Calero-Medina, C.M. (2016). Discussing practical applications for altmetrics: development of ‘social media profiles’ for African, European and North American publications. (paper)
• Fraumann, G., Costas, R., Mugnaini, R., Packer, A.L., & Zahedi, Z. (2016). Twitter presence and altmetrics counts of SciELO Brazil Journals. (paper)
• Zahedi, Z., Costas, R., Larivière, V., & Haustein, S. (2016). What makes papers visible on social media?: An analysis of various document characteristics. In Rafols, I., J. Molas-Gallart, E. Castro-Martínez, & R. Woolley (Eds.), Proceedings of the 21st International Conference on Science and Technology Indicators (pp. 1196-1199). (paper)
• Zahedi, Z., Haustein, S., Larivière, V., & Costas, R. (2016). On the relationships between bibliometric and altmetric indicators: The effect of discipline and density level. (paper)
• Costas, R., Nane, G.F., & Larivière, V. (2015). Is the Year of First Publication a Good Proxy of Scholars' Academic Age? 15th International Society of Scientometrics and Infometrics Conference, Istanbul. In Proceedings of the 15th International Conference of the International Society for Scientometrics and Informetrics (pp. 988-998).
• Fraumann, G., Zahedi, Z., & Costas, R. (2015). What do we know about Altmetric.com sources? : A study of the top 200 blogs and news sites mentioning scholarly output. (paper)
• Haustein, S., Bowman, T.D., & Costas, R. (2015). When is an article sctually published? : an analysis of online availability, publication, and idexation dates. In Proceedings of the 15th International Conference of the International Society for Scientometrics and Informetrics (pp. 1170-1179).
• Larivière, V., & Costas, R. (2015). How many is too many? : On the relationship between output and impact in research. In A.A. Salah, Y. Tonta, A.A. Akdag Salah, C.R. Sugimoto, & U. Al (Eds.), Proceedings of the 15th International Conference of the International Society for Scientometrics and Informetrics (pp. 590-595).
• Robinson-García, N., Noyons, E.C.M., & Costas, R. (2015). Can We Track the Geography of Surnames Based on Bibliographic Data? In Proceedings of the 15th International Conference of the International Society for Scientometrics and Informetrics (pp. 1208-1217).
• Zahedi, Z., Costas, R., & Wouters, P. (2015). Do mendeley readership counts help to filter highly cited WoS publications better than average citation impact of journals (JCS)? In Proceedings of the 15th International Conference of the International Society for Scientometrics and Informetrics (pp. 16-25). (paper)
• Zahedi, Z., Fenner, M., & Costas, R. (2015). Challenges in altmetric data collection: are there differences among different altmetric providers/aggregators?. (paper)
• Zahedi, Z., Fenner, M., & Costas, R. (2015). Consistency among altmetrics data provider/aggregators: What are the challenges? Altmetrics workshop, 9 October 2015, Amsterdam Science Park, Amsterdam. (paper)
• Costas, R., Zahedi, Z., & Wouters, P. (2014). Disentangling the meaning of ‘altmetrics’: Content analysis of Web of Science scientific publications. In altmetrics14: expanding impacts and metrics - An ACM Web Science Conference 2014 Altmetrics Workshop. (paper)
• Zahedi, Z., Costas, R., & Wouters, P. (2014). Assessing the impact of the publications read by the different Mendeley users: Is there any different pattern among users? In Proceedings of the IATUL Conferences. (paper)
• Zahedi, Z., Costas, R., & Wouters, P. (2014). Broad altmetric analysis of Mendeley readerships through the academic status of the readers of scientific publication. In Proceedings of the 19th International Conference on Science and Technology Indicators (pp. 720-727).
• Zahedi, Z., Fenner, M., & Costas, R. (2014). How consistent are altmetrics providers? Study of 1000 PLOS ONE publications using the PLOS ALM, Mendeley and Altmetric.com APIs. In altmetrics14: expanding impacts and metrics - An ACM Web Science Conference 2014 Altmetrics Workshop. doi:10.6084/m9.figshare.1041821 (paper)
• Costas, R., & Yegros, A. (2013). Possibilities of funding acknowledgement analysis for the bibliometric study of research funding organizations: case study of the Austrian Science Fund (FWF). In J. Gorraiz, E. Schiebel, C. Gumpenberger, M. Hörlesberger, & H.F. Moed (Eds.), Proceedings of the 14th International Conference of the International Society for Scientometrics and Informetrics (pp. 1401-1408).
• Costas, R., Calero-Medina, C.M., Waltman, L., & Wouters, P. (2013). The relationship between the performance of editorial board members and the impact of scientific journals : an exploratory analysis. In Proceedings of 18th International Conference on Science and Technology Indicators (pp. 87-95).
• Reijnhoudt, L., Costas, R., Noyons, E.C.M., Borner, K., & Scharnhorst, A. (2013). 'Seed plus expland: a validated methodology for creating high quality publication oeuvres of individual researchers. In Proceedings of the 14th International Conference of the International Society for Scientometrics and Informetrics (pp. 1587-1600).
• Yegros, A., & Costas, R. (2013). Analysis of the Web of Science Funding Acknowledgement Information for the Design of Indicators on 'External Funding Attraction'. In Proceedings of the 14th International Conference of the International Society for Scientometrics and Informetrics (pp. 84-95).
• Zahedi, Z., Costas, R., & Wouters, P. (2013). How well developed are Altmetrics? Cross-disciplinary analysis of the presence of 'alternative metrics' in scientific publications. In J. Gorraiz, E. Schiebel, C. Gumpenberger, M. Hörlesberger, & H.F. Moed (Eds.), Proceedings of the 14th International Conference of the International Society for Scientometrics and Informetrics. (paper)
• Zahedi, Z., Costas, R., & Wouters, P. (2013). What is the impact of the publications read by the different Mendeley users? Could they help to identify alternative types of impact? PLoS ALM Workshop, San Francisco. San Francisco, US.: PLoS ALM Workshop. (paper)
• Bordons, M., Aparicio, J., & Costas, R. (2012). Trends in the Collaborative Structure of the Spanish Pharmacological Scientific Production and its Influence over Research Impact. In Proceedings of the 17th International Conference on Science and Technology Indicators (pp. 142-154).
• Costas, R., & Van Bochove, C.A. (2012). On the relationship between author collaboration and impact of scientific publications. In Y. Gingras, E. Archambault, & V. Larivière (Eds.), Proceedings of the 17th International Conference on Science and Technology Indicators (pp. 447-448).
• 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).
• 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).
• 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).

Book chapters (2)

• Wouters, P., Zahedi, Z., & Costas, R. (2019). Social media metrics for new research evaluation. In W. Glänzel, H.F. Moed, U. Schmoch, & M. Thelwall (Eds.), Springer Handbook of Science and Technology Indicators. Springer. (paper)
• Haustein, S., Bowman, T.D., & Costas, R. (2016). Interpreting “altmetrics": viewing acts on social media through the lens of citation and social theories. Berlin: De Gruyter. In C.R. Sugimoto (Ed.), Theories of informetrics and scholarly communication: A Festschrift in Honor of Blaise Cronin (pp. 372-405). (paper)