Produced by the American Mathematical Society, MathSciNet consists of reviews and citations to the world's research literature in mathematics and related areas compiled from Mathematical Reviews and Current Mathematical Publications.

Indexes and abstracts citations in research journals across the disciplinary spectrum. It includes Science Citation Index (1900-present).

ArXiv is a collection of electronic pre-prints and an e-print service in the fields of physics, mathematics, non-linear science and computer science.