PubMed indexes over 4,000 biomedical, nursing, dentistry and related journals, with over 21 million citations in MEDLINE, PreMEDLINE and related databases. PubMed is produced by the National Center for Biotechnology Information (NCBI) and provides links between article citations and relevant data in other NCBI ENTREZ databases, including Nucleotide and Protein Sequences, Protein Structures, Complete Genomes, Taxonomy, and others.
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International multi-disciplinary indexing & abstracting database for scientific, medical, technical, and social sciences. Searchable by cited-reference (forward citation searching). Covers journals, patents, and websites (16,500+ titles) from 4,000+ publishers.
Covering 12,000+ scholarly journals, plus selected books and published conference proceedings in all academic disciplines, the Web of Science Core Collection combines seven citation indexes which permit searching for articles that cite a known author or work, as well as searching by subject, author, journal, and author address/