![]() Little is known about the coverage of Google Scholar. It is primarily a search engine for scholarly literature, and it provides only very limited bibliographic meta data on publications. It should be emphasized that Google Scholar is of a very different nature than WoS and Scopus. The paper concludes by offering some recommendations for future research. Google Scholar is made freely available by Google. Counting methods for dealing with co-authored publications are the third topic, and citation impact indicators for journals are the last topic. The second topic is the normalization of citation impact indicators, in particular normalization for field differences. The first topic is the selection of publications and citations to be included in the calculation of citation impact indicators. Next, selected topics in the literature on citation impact indicators are reviewed in detail. ![]() First, an overview is given of the literature on bibliographic databases that can be used to calculate citation impact indicators (Web of Science, Scopus, and Google Scholar). This paper provides an in-depth review of the literature on citation impact indicators. Citation impact indicators nowadays play an important role in research evaluation, and consequently these indicators have received a lot of attention in the bibliometric and scientometric literature. ![]()
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