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Cornell University Library arXiv.org
arXiv is an e-print service that provides open access to almost 1.3 million e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics. It is owned and operated by Cornell University.
Google Scholar searches for references to scholarly articles and research papers. Sometimes the full text is posted online and linked, other times users will see a "Find It at Sac State" option next to the Google Scholar listing (see explaination above). Follow these instructions to configure Google Scholar to display the "Find It at Sac State" link. Except for the most simple queries, using Google Scholar Advanced Search is recommended.