Self-citations — those where authors cite their own works — account for a significant portion of all citations. These self-references may result from the cumulative nature of individual research, the need for personal gratification, or the value of self-citation as a rhetorical and tactical tool in the struggle for visibility and scientific authority. In this article we examine the incentives that underlie self-citation by studying how authors’ references to their own works affect the citations they receive from others. We report the results of a macro study of more than half a million citations to articles by Norwegian scientists that appeared in the Science Citation Index. We show that the more one cites oneself the more one is cited by other scholars. Controlling for numerous sources of variation in cumulative citations from others, our models suggest that each additional self-citation increases the number of citations from others by about one after one year, and by about three after five years. Moreover, there is no significant penalty for the most frequent self-citers — the effect of self-citation remains positive even for very high rates of self-citation. These results carry important policy implications for the use of citations to evaluate performance and distribute resources in science and they represent new information on the role and impact of self-citations in scientific communication.
KeywordsCitation Analysis Citation Count Total Citation Matthew Effect Additional Citation
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- 7.S. Bonzi, H. W. Snyder, Patterns of self-citation across fields of inquiry, Proceedings of the ASIS annual meeting, 27 (1990) 204–207.Google Scholar
- 9.R. Tagliacozzo, Self-citation in scientific literature, Journal of Documentation, 33 (1977) 251–265.Google Scholar
- 12.T. N. van Leeuwen, E. J. Rinia, A. F. J. van Raan, Bibliometric Profiles of Academic Physics Research in the Netherlands, Report CWTS 96-09, Centre for Science and Technology Studies, Leiden, 1996.Google Scholar
- 13.M. E. J. Newman, Scientific collaboration networks: I. Network construction and fundamental results, Physical Review E, 64 (2001) 016131.Google Scholar
- 14.M. E. J. Newman, Scientific collaboration networks: II. Shortest paths, weighted networks, and centrality, Physical Review E, 64 (2001) 016132.Google Scholar
- 16.D. W. Aksnes, Characteristics of highly cited papers, Research Evaluation, 12 (2003) 159–170.Google Scholar