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MEDLINE is the US National Library of Medicine's premier bibliographic database covering the fields of medicine, nursing, dentistry, veterinary medicine, the health care system, and the pre-clinical sciences. MEDLINE contains bibliographic citations and author abstracts from more than 4,300 biomedical journals published in the United States and 70 other countries.
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http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?
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The Science Citation Index (SCI®) provides access to current and retrospective bibliographic information, author abstracts, and cited references found in 3,700 of the world's leading scholarly science and technical journals covering more than 100 disciplines. The Science Citation Index Expanded™ format, available through the Web of Science® and the online version, SciSearch®, cover more than 5,800 journals.
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http://scientific.thomson.com/products/sci/
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Google Scholar enables you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research. Use Google Scholar to find articles from a wide variety of academic publishers, professional societies, preprint repositories and universities, as well as scholarly articles available across the web.
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http://scholar.google.com/scholar/about.html
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CrossRef is an independent membership association, founded and directed by publishers. CrossRef’s mandate is to connect users to primary research content, by enabling publishers to do collectively what they can’t do individually. CrossRef is also the official DOI registration agency for scholarly and professional publications. It operates a cross-publisher citation linking system that allows a researcher to click on a reference citation on one publisher’s platform and link directly to the cited content on another publisher’s platform, subject to the target publisher’s access control practices. Our citation-linking network today covers millions of articles and other content items from several hundred scholarly and professional publishers.
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http://www.crossref.org/
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CAS databases provide millions of journal article references from nearly 9,500 major scientific journals worldwide and patent and patent family references from more than 50 active patent-issuing authorities around the world.
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www.cas.org
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