20 sites in Publications
ArXiv
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Open e-print archive with over 100,000 articles in physics, 10,000 in mathematics, and 1,000 in computer science. (Formerly called xxx; free)
http://arxiv.org/
EMANI
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Electronic Mathematical Archiving Network Initiative: to support the long-term electronic preservation of mathematical publications.
http://www.emani.org/
NUMDAM
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Digitization of old mathematics documents. Free access to bibliographical data and articles of french mathematical journals. For each journal, all the volumes published up to the year 2000 have been retro-digitized.
http://www.numdam.org/en/
Forum - Usenet sci.math.research
See also
The category Publicationsin other languages