Academic Search Premier: This multi-disciplinary database provides full text for more than 4,600 journals, including full text for nearly 3,900 peer-reviewed titles. PDF backfiles to 1975 or further are available for well over one hundred journals, and searchable cited references are provided for more than 1,000 titles.
MathSciNet: Math and physics literature 1940-
Smithsonian/NASA Astrophysics Data System: The SAO/NASA Astrophysics Data System (ADS) maintains three bibliographic databases containing more than 9.0 million records: Astronomy and Astrophysics, Physics, and arXiv e-prints.
Web of Science (Science Citation Index): Allows searching the journal literature in all branches of the sciences not only by subject or author, but also by cited author or article. 1955-
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