3. Knowing the limits of Google Scholar
Using Google Scholar presents a number of difficulties and weaknesses, first and foremost the opacity and incompleteness of its corpus.
Some sources are known (Elsevier, INIST, SUDOC, Ingenta, PubMed, Springer...), but there is no list of indexed titles on the Google Scholar site, nor is there a list of sources (commercial publishers, archive servers...).
Nor is there any indication of the period covered or the frequency of updates, and therefore of the freshness of the content.
Also missing is a presentation of the types of scientific documents used and the selection criteria; in fact, it seems that Google Scholar also integrates resources that are not academic, but which have more or less the appearance of scientific articles (author, title, institution, source)....
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Knowing the limits of Google Scholar
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Bibliography
Gusenbauer (M.), Google Scholar to overshadow them all? Comparing the sizes of 12 academic search engines and bibliographic databases, Scientometrics, vol. 118, no. 1, January 2019, pp. 177-214.
Meho (L.I.) and Yang (K.), Impact of data sources on citation counts and rankings of LIS faculty: Web of Science versus Scopus and Google Scholar. Journal of the American society for information science and...
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