http://liinwww.ira.uka.de/bibliography/index.html

The collection currently contains more than one million references (mostly to journal articles, conference papers and technical reports) and consists of 660 MBytes of BibTeX entries. More than 16000 references contain crossreferences to citing or cited publications. More than 100,000 references contain URLs to an online version of the paper. There are more than 2000 links to other sites carrying bibliographic information.