From Eugene Garfield’s Citation Index to Scopus and Google Scholar
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This presents a comparative analysis of three large, multi-disciplinary citation indexes. It starts with a presentation of the basic principles of the Science Citation Index (SCI, later Thomson Reuters’ Web of Science), a multi-disciplinary citation index created by Eugene Garfield in the early 1960s. Next, it presents a study conducted in 2009 comparing the Web of Science with Scopus, a comprehensive citation index launched by Elsevier in 2004, and a recent study comparing Scopus with an even more comprehensive citation index, Google Scholar, also launched in 2004.