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4 27 1391 " "... " "...6 (Van Raan 1998) (Rousseau 1992) (Glanzel and Thijs 2004) (Costas et al. 2010)......... ( ). ( ) 958
:...7.1388..34-25 :6.DOAJ ISI ISI.1387. :(4) 1. 2005 1989.19-11.1388..22-5 :(1) 25..1388..98-79 :(1) 12. -1383.1386..136-125 :(4) 18.1374 Web of science.1387...2003.1388. :.226-207 :(2) 25..1386..64-53 :(1) 6..1388..206-189 :(2) 25.(ISC) -.1386..338 333 :(4) 31.1385.1387..82-73 :(4) 1.2007 1990 Aksnes, D.W. 2003. A macro study of self-citation. Scientometrics 56 (2): 235-246. Costas R. et al. 2010. Self-citations at the meso and individual levels: effects of different calculation methods. Scientometrics 82: 517-537. Daya, Salim. 2004. Self citation and journal impact factor. Evidence based obstetrics and gynecology 6 (4): 159-160. 959
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Iranian Research Institute For Science and Technology ISSN 2251-8223 eissn 2251-8231 Indexed in LISA, SCOPUS & ISC Vol.27 No.4 pp: 945-960 summer 2012 High Citation of Iranian Coauthored articles in comparison with single authored ones: does it link with self-citation Seaid Nazarian* MA in Library and Information Science, Public Libraries Institution Hashem Atapour 1 PhD Candidate in Library and Information Science, Tehran University Abdolreza Noroozi Chakoli 2 Assistant Professor in Library and Information Sciences, Shahed University Abstract: The aim of this research was to investigate the effect of coauthorship and self-citation on the citation rates of Iranian indexed articles in Web of Science (WoS). Research population included Iranian indexed articles in WoS in 2007 which had been received at least one citation. Numbers of articles in the time of research (October & November 2010) was 7355, which 390 of them, using stratified random sampling, was selected as sample. Research results showed that coauthored articles have received more citations than single-authored ones and this difference was statistically significant. On the other hand, selfcitation exclusion has significantly reduced the citation rates of both coauthored and single-authored articles. After self-citation exclusion, existing difference between citation rates of co-authored and singleauthored articles lost its significance. So, it can be concluded that selfcitation exclusion led to reduction of citation rates of Iranian indexed articles in WoS, but this exclusion affected co-authored articles citation rates more than single-authored ones. In other words, high citation of Iranian co-authored articles in comparison with single-authored articles has been affected mainly by self-citation, not by foreign citation. This finding, which was our contribution, contradicted with results of previous researches. Keywords: citation, Iran, co-authorship, self-citation, Web of Science *Corresponding author: saeid.nazarian@gmail.com 1. hashematapour@ut.ac.ir 2. noroozi@shahed.ac.ir viii