CiteSeerX is an evolving scientific literature digital library and search engine that has focused primarily on the literature in computer and information science. CiteSeerX aims to improve the dissemination of scientific literature and to provide improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness in the access of scientific and scholarly knowledge.
(Companion to MathSciNet) The JFM database will serve as a portal for the user to find mathematical publications of the period 1868-1942. It includes links to digital articles from many of the publications.
MathSciNet is an electronic publication offering access to a carefully maintained and easily searchable database of reviews, abstracts and bibliographic information for much of the mathematical sciences literature. Over 125,000 new items are added each year, most of them classified according to the Mathematics Subject Classification.