Web of Science
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1980-present plus citations to older cited references; updated weekly; some full-text
Web of Science (also called as SCI - Science Citation Index, formerly Web of Knowledge) is an online subscription-based scientific citation indexing service that provides a comprehensive citation search. It gives access to multiple databases that reference cross-disciplinary research, which allows for in-depth exploration of specialized sub-fields within an academic or scientific discipline.
This database includes Web of Science Core Collection (Arts & Humanities Citation Index, Derwent Innovations Index, Science Citation Index, Conference Proceedings Citation Index - Science Edition, and Social Sciences Citation Index), BIOSIS Citation Index, BIOSIS Previews,Biological Abstracts,Conference Proceedings Citation Index - Social Sciences and Humanities Edition, KCI-Korean Journal Database, SciELO Citation Index, and MEDLINE. You can perform Cited Reference Searching in the Web of Science Core Collection. You can link to Journal Citation Reports and Essential Science Indicators from this platform as well.