Open access and sources of full-text articles in Google Scholar in different subject fields
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Google Scholar, a widely used academic search engine, plays a major role in finding free full-text versions of articles. But little is known about the sources of full-text files in Google Scholar. The aim of the study was to find out about the sources of full-text items and to look at subject differences in terms of number of versions, times cited, rate of open access availability and sources of full-text files. Three queries were created for each of 277 minor subject categories of Scopus. The queries were searched in Google Scholar and the first ten hits for each query were analyzed. Citations and patents were excluded from the results and the time frame was limited to 2004–2014. Results showed that 61.1 % of articles were accessible in full-text in Google Scholar; 80.8 % of full-text articles were publisher versions and 69.2 % of full-text articles were PDF. There was a significant difference between the means of times cited of full text items and non-full-text items. The highest rate of full text availability for articles belonged to life science (66.9 %). Publishers’ websites were the main source of bibliographic information for non-full-text articles. For full-text articles, educational (edu, ac.xx etc.) and org domains were top two sources of full text files. ResearchGate was the top single website providing full-text files (10.5 % of full-text articles).
KeywordsGoogle Scholar Open access Full text version Citation version Citation number Scopus subject categories
The study was funded by Kharazmi University and the senior author would like to thank the LIS department of Tabriz University for hosting him during his sabbatical while working on this study.
- Archambault, E., Amyot, D., Deschamps, P., Nicol, A., Rebout, L., & Roberge, G. (2013). Proportion of open access peer-reviewed papers at the European and world levels—2004–2011. Science-Metrix. Report. Science Matrix Inc. http://www.science-metrix.com/pdf/SM_EC_OA_Availability_2004-2011.pdf. Accessed 10 October 2013.
- Gargouri, Y., Larivière, V., Gingras, Y., & Harnad, S. (2012). Green and Gold Open Access Percentages and Growth, by discipline. In E. Archambault, Y. Gingras, & V. Larivière (Eds.), Proceedings of 17th international conference on science and technology indicators. Montréal: Science-Metrix and OST. http://sticonference.org/Proceedings/vol1/Gargouri_Green_285.pdf. Accessed 10 October 2013.
- Martín-Martín, A., Orduña-Malea, E., Ayllón, J.M., Delgado López-Cózar, E. (2014). Does Google Scholar contain all highly cited documents (1950–2013)? EC3 working papers, 19. http://arxiv.org/abs/1410.8464. Accessed 25 March 2015.
- Orduña-Malea, E., Ayllón, J. M., Martín-Martín, A., & López-Cózar, E. D. (2014). About the size of Google Scholar: playing the numbers. arXiv preprint. https://dspace.muni.cz/jspui/bitstream/ics_muni_cz/1022/1/ZatrochovaEsej.pdf. Accessed 10 October 2013.
- Publishers Weekly. (2014). Global publishing leaders 2014: Reed Elsevier. http://www.publishersweekly.com/pw/by-topic/industry-news/publisher-news/article/63099-global-publishing-leaders-2014-reed-elsevier.html Accessed 03 April 2015.
- Sanni, S. A., & Zainab, A. N. (2010). Google Scholar as a source for citation and impact analysis for a non-ISI indexed medical journal. Malaysian Journal of Library and Information Science, 15(3), 35–51.Google Scholar
- Zhou, P., & Leydesdorff, L. (2008). China ranks second in Scientific Publications since 2006. ISSI Newsletter, 13, 7–9.Google Scholar