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The Web of Science by Clarivate Analytics contains references of international journal articles from all scientific disciplines.
It includes data from eight citation indexes:
- Science Citation Index Expanded
- Social Sciences Citation Index
- Arts and Humanities Citation Index
- Conference Proceedings Citation Index - Science (CPCI-S)
- Conference Proceedings Citation Index - Social Science & Humanities (CPCI-SSH)
- Book Citation Index - Science (BKCI-S)
- Book Citation Index - Social Science & Humanities (BKCI-SSH)
- Emerging Sources Citation Index
Chemical indexes:
- Current Chemical Reactions (CCR-EXPANDED)
- Index Chemicus (IC)
Citation indexes offer a unique search method to find later-published journal articles, in which a publication is cited.
Coverage: daily updates
Self-teaching module: WoS training resources
Related: Journal Citation Reports

RUQuest is a search engine for the collection of the RU University Library, Nijmegen, and for collections of other libraries worldwide.
RUQuest contains printed and digital books, periodicals, journal articles, book chapters and more.
Full text publications can be opened by clicking 'View full text'.
Tutorial: RUQuest

GreenFILE is a resource that covers human impact on the environment. The multidisciplinary research database contains scholarly and government publications, alongside publications of general interest.
Alternative freely accessible access via http://www.greeninfoonline.com/

In Google Scholar, you can find references to academic publications in many different disciplines and forms (e.g. journal articles and preprints). A lot of these publications are available freely online.
Citation data of the publication (who cites who in Google Scholar) can be found at 'Cited by'.
Manual: Connect Google Scholar to the University Library

The International Bibliography of the Social Sciences (IBSS) includes bibliographic references to international journal articles, books, reviews, and selected chapters in the field of economy, political science, social and cultural anthropology, and sociology.
Coverage: 1951 - present, updated bi-weekly
Related database: Sociological Abstracts