The Science Citation Index Expanded – previously titled Science Citation
Index – is a citation index originally produced by the Institute for
Scientific Information (ISI) and created by Eugene Garfield.
It was officially launched in 1964 and is now owned by Clarivate (previously
the Intellectual Property and Science business of Thomson Reuters).
The indexing database covers more than 9,200 notable and significant journals,
across 178 disciplines, from 1900 to the present. These are alternatively
described as the world's leading journals of science and technology, because
of a rigorous selection process.
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