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Literature Search Engines

*   PubMed
PubMed comprises more than 20 million citations for biomedical literature, life science journals, and online books. Citations may include links to full-text content

*   Google Scholar
Provides a search of scholarly literature across many disciplines including theses, books, abstracts, patents and articles

*   PubMed Central
A free digital archive of biomedical and life sciences journal literature

*  Scirus
A comprehensive scientific research tool allows search  journals, scientists' homepages, courseware, pre-print server material, patents etc.

*   Scopus
A large abstract and citation database of research literature and web sources