![]() ![]() They are lower in the Humanities, and lower between GS and WoS than between GS and Scopus. Despite the many unique GS citing sources, Spearman correlations between citation counts in GS and WoS or Scopus are high (0.78-0.99). Many were non-English (19%-38%), and they tended to be much less cited than citing sources that were also in Scopus or WoS. Most citations found only by GS were from non-journal sources (48%-65%), including theses, books, conference papers, and unpublished materials. GS found nearly all the WoS (95%) and Scopus (92%) citations. ![]() GS consistently found the largest percentage of citations across all areas (93%-96%), far ahead of Scopus (35%-77%) and WoS (27%-73%). ![]() In response, this paper investigates 2,448,055 citations to 2299 English-language highly-cited documents from 252 GS subject categories published in 2006, comparing GS, the WoS Core Collection, and Scopus. Despite citation counts from Google Scholar (GS), Web of Science (WoS), and Scopus being widely consulted by researchers and sometimes used in research evaluations, there is no recent or systematic evidence about the differences between them. ![]()
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