In “Measuring citations: Calculations can vary widely”, published in ScienceNews October 5, 2009, Janet Raloff reports on findings by Abhaya Kulkarni and his colleagues who compared three indexing services: Web of Science, Scopus and Google Scholar. Not surprisingly the results were different between these services, because they index different publications. Perhaps the most important part of the article though is the point Kulkarni makes about the implications of not counting citations from non-high impact factor journals. Implications that might include: research that gets little or no credit if it is not cited in high-impact factor journals; or a failure to gauge the true influence of a particular piece of research if it is not cited in journals with high impact factors.
See the full article here: http://www.sciencenews.org/view/generic/id/48057

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