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The Mathematics Subject Classification is a useful tool for searching MathSciNet, Zentralblatt, or any other resource that uses this classification system. Browse or search the file to find all classification numbers related to your topic of interest.
Indexes and Databases
To search for articles on a particular topic try one of the following math-related indexes or databases. If your topic is interdisciplinary, databases related to other disciplines may also be helpful.
Citations and abstracts from the Jahrbuch database are included in Zentralblatt MATH (see above), but the Jahrbuch Project also includes digitized full text versions of the most important publications from 1868-1942.
JSTOR is a non-profit project to archive digitized (scanned) back volumes of important journals online, based on agreements with publishers. Usually, there is a 3-5 year "moving wall", so current content is not included ---EXCEPT--for certain journals, like Mathematical Association of America journals -- good to know.