We must know the meanings of some basic terms that determine whether our research publication has "impact". The first term is "Citation Index". According to Wikipedia, a citation index is an index of citations between publications, allowing the user to easily establish which later documents cite which earlier documents. Wikipedia further notes that in 1960, Eugene Garfield's Institute for Scientific Information (ISI) introduced the first citation index for papers published in academic journals, starting with the Science Citation Index (SCI), and later expanding to produce the Social Sciences Citation Index (SSCI) and the Arts and Humanities Citation Index (AHCI). There are two publishers of general-purpose academic citation indexes:
(i) ISI is now part of Thomson Scientific. Though the ISI citation indexes are still published in print and compact disc, they are now generally accessed through the Web under the name Web of Science, which is in turn part of the group of databases in WoK.
(ii) Elsevier publishes Scopus, available online only, which similarly combines subject searching with citation browsing and tracking in the sciences and social sciences.
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