- ArXiv.org
http://arxiv.org/
An Open Archives Initiative (OAI) compliant archive of electronic preprints in physics, mathematics, computer science, and non-linear sciences. Created by Paul Ginsparg in 1991, it is one of the oldest archives of free online scholarship.
- CCSD: Hyper Article Online
http://hal.ccsd.cnrs.fr/
An interface for submitting scientific papers to the article database of the french Centre pour la Communication Scientifique Directe. Papers in mathematics, physics, information science are instantly and automatically directed to "arXiv" [bilingual site in english/french].
- CiteSeer
http://citeseer.ist.psu.edu/
Autonomously creates citation indexes of scientific literature. Generates citation statistics and allows easy browsing of the context of citations. Texts freely available in PDF, PS, HTML format..
- Cogprints
http://cogprints.ecs.soton.ac.uk/
Makes preprints and reprints of papers in all areas of the cognitive sciences freely available on-line. Authors can deposit their work in the archive after a (free) registration.
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