CiteSeer - Scientific Literature Digital Library and Search Engine

CiteSeer^x is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. CiteSeer^x 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.

Rather than creating just another digital library, CiteSeer^x attempts to provide resources such as algorithms, data, metadata, services, techniques, and software that can be used to promote other digital libraries. CiteSeer^x has developed new methods and algorithms to index PostScript and PDF research articles on the Web. Citeseer^x provides the following features. 

http://citeseerx.ist.psu.edu/