MathSciNet (American Mathematical Society) This link opens in a new windowMathSciNet contains over 3 million items and 2 million direct links to original articles in more than 3,000 journals from over 250 publishers. Over 110,000 new items are added each year with most of them classified according to the Mathematics Subject Classification. Each year, over 80,000 reviews are added, written by experts around the world.