Google Scholar, Web of Science, and Scopus: A systematic comparison of citations in 252 subject categories

•Google Scholar found nearly all citations found by WoS (95%) and Scopus (92%), and a large amount of unique citations.•About half of Google Scholar unique citations are not from journals. A significant minority (19–38%) are not in English.•Google Scholar unique citations have, on average, a much lo...

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Veröffentlicht in:	Journal of informetrics Jg. 12; H. 4; S. 1160 - 1177
Hauptverfasser:	Martín-Martín, Alberto, Orduna-Malea, Enrique, Thelwall, Mike, Delgado López-Cózar, Emilio
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Elsevier Ltd 01.11.2018
Schlagworte:	Academic search engines Bibliographic databases Bibliometrics Citation analysis Citation overlap Coverage Google Scholar Scientometrics Scopus Unique citations Web of Science Web of Science Unique citations Scientometrics Citation analysis Bibliometrics Scopus Citation overlap Bibliographic databases Coverage Academic search engines Google Scholar
ISSN:	1751-1577, 1875-5879
Online-Zugang:	Volltext
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