PubMed, a service of the National Library of Medicine, provides access to millions of citations from MEDLINE and additional life science journals. PubMed includes links to many sites providing full text articles and other related resources.
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Scopus is a multi-disciplinary abstract and citation database which includes journal articles and patents. Scopus also tracks cited references, allowing users to search for subsequently published papers that cite an original research paper.
Academic Search Complete is a comprehensive, scholarly, multi-disciplinary full-text database. It includes numerous full-text periodicals, many of which are peer-reviewed. In addition to full text, this database offers indexing and abstracts for a number of journals and other publications including monographs, reports, conference proceedings etc. The database features PDF content going back as far as 1887, with the majority of full text titles in searchable PDF format.