MathSciNet: Mathematical Reviews on the web

The database, which includes Mathematical Reviews (MR) and Current Mathematical Publications (CMP), covers the international literature relating to mathematics since 1864: there are over 2 million records. Over 700,000 report the direct link to the full text of the document.

The records, including reviews, concern articles taken from approximately 1,800 international mathematical journals, as well as 7,500 monographs, proceedings, doctoral theses and annual technical reports. Papers are indexed through the international classification scheme for Mathematical Subject Classification, which contains over 5,000 entries.

American Mathematical Society