A preprint is a draft of a scientific paper that has not yet been published in a peer-reviewed scientific journal
- arXiv organization - PREPRINTS
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arxiv.org
- arXiv organization different mirror sites - PREPRINTS
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arxiv.org/servers.html
- SCIENTIFIC COMMONS - PREPRINTS
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www.scientificcommons.org
- ROAR - Registry of Open Access Repositories
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roar.eprints.org
