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arXiv.orgAn e-print service in the fields of physics, mathematics, non-linear science, computer science, and quantitative biology
The Cochrane LibraryConsists of a collection of seven evidence-based medicine databases. Includes systematic reviews from the Cochrane Collaboration, which present research on the effects of healthcare.
MEDLINE (Online : OvidSP)Provides combined access to Medline and Medline In-Process & Other Non-Indexed Citations. Includes biomedicine, dentistry, nursing and related topics.