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Scopus is a scientific abstract and citation database, launched by the academic publisher Elsevier as a competitor to older Web of Science in 2004. [1] An ensuing competition between the two databases has been characterized as "intense" and is considered to significantly benefit their users in terms of continuous improvent in coverage, search/analysis capabilities, but not in price.
Metadata for 260 million documents from more than 8,000 content providers Free Bielefeld University: Book Review Index Online: Book reviews: 5,600,000 Reviews of periodicals and books – including those on tape and electronic media Subscription Thomson Gale: Books in Print: Books: 2,500,000 Reviews covering over 2.5 million titles Subscription ...
An indexing service is a service that assigns descriptors and other kinds of access points to documents. The word indexing service is today mostly used for computer programs, but may also cover services providing back-of-the-book indexes , journal indexes , and related kinds of indexes .
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Moreover, search terms generate related information across categories. Acceptable content for Web of Science is determined by an evaluation and selection process based on the following criteria: impact, influence, timeliness, peer review, and geographic representation. [8] Web of Science employs various search and analysis capabilities.
The journals are grouped into four main sections: Physical Sciences and Engineering; Life Sciences; Health Sciences; Social Sciences and Humanities.; Article abstracts are freely available, and access to their full texts (in PDF and, for newer publications, also HTML) generally requires a subscription or pay-per-view purchase unless the content is freely available in open access.
ResearchGate was visited regularly by half of those surveyed by Nature, coming second to Google Scholar. 29 percent of regular visitors had signed up for a profile on ResearchGate in the past year, [5] and 35% of the survey participants were invited by email. [5]
The Chemistry Citation Index was first introduced by Eugene Garfield, a chemist by training. His original "search examples were based on [his] experience as a chemist". [17] In 1992, an electronic and print form of the index was derived from a core of 330 chemistry journals, within which all areas were covered.