The National Library of Medicine's free article search engine, containing article references from MEDLINE, PreMEDLINE, OLDMEDLINE, plus publisher-supplied and out-of-scope citations from science and chemistry journals.
Database with abstracts and citations of research literature and quality web sources, including journals, conference proceedings, trade publications, abstracts, and patent records. A multidisciplinary resource covering materials from the humanities, sciences and social sciences. Also indexes EMBASE and allows you to locate the most highly cited items and the articles that cite them.