MathSciNet is a comprehensive database covering the world's mathematical literature since 1940, providing Web access to the bibliographic data and reviews of mathematical research literature contained in the Mathematical Reviews Database.
The Web of Science provides seamless access to current and retrospective multidisciplinary information from approximately 8,700 of the most prestigious, high impact research journals in the world.
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Open access is a principle by which content is made available online free of charge and with minimal copyright and licensing restrictions. Check out resources that educate and elaborate on what open access is.