Searchable database contains bibliographic information, abstracts, reviews, and the full-text for articles published in ACM periodicals and proceedings since 1947.
Multidisciplinary index to scholarly and authoritative articles. Provides access to all three parts of the Citation Index: Arts and Humanities, Social Science and Science. Search by subject, author, journal title. Cited Reference Search finds articles that cite an author or article that you specify.
Large multidisciplinary search engine with results ranking and previews. Google Scholar indexes scholarly literature including journal articles. *Note: free public access available at http://scholar.google.com/
Searchable database of citations for articles in 'Mathematical Reviews' from the American Mathematical Society. Covers mathematics, statistics, engineering, and the physical sciences. Full-text links to many original articles from the American Mathematical Society. Tutorials are available at http://www.mathscinet.info/index.html