Banca dati citazionale. Indicizza riviste scientifiche peer-reviewed, atti di conferenze, libri. L'aggiornamento è settimanale.
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La "Web of Science Core Collection" comprende: Science Citation Index Expanded (1988-present) Social Sciences Citation Index (1988-present) Arts & Humanities Citation Index (1988-present) Conference Proceedings Citation Index- Science (1990-present) Conference Proceedings Citation Index- Social Science & Humanities (1990-present) Emerging Sources Citation Index (2015-present)