Influences Upon Science Citation Index and Google
In 1960, Eugene Garfield developed Science Citation Index (SCI), which he later expressly acknowledged was heavily influenced in several ways by Shepard's Citations. SCI indexes scientific journal articles, and shows what other articles they have been cited by. SCI also counts the number of citations each article gets, thus forming a citation index of the most-cited articles and journals. In turn, SCI inspired several other scientists to research the possibility of developing superior citation indexes. Among those, a method developed by Gabriel Pinski and Francis Narin in 1976 was a major influence upon the PageRank link analysis algorithm created by Sergei Brin and Larry Page, which became the heart of the Google search engine.
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