Scientometrics are increasingly used to evaluate scientists for positions, etc. Some while ago, citation numbers for individuals (and derived parameters, such as the h-index) could only be obtained via Thomson Reuters  ISI Web of Science. Then came Elsevier’s Scopus, and now we also have Google Scholar Citations. Most reseachers use them without much thinking about them, and quite often without referencing the specific source they used to obtain their personal metrics. However, the citation counts and h-indices calculated by these 3 services may be very different.

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