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A repository in publishing, and especially in academic publishing, is a real or virtual facility for the deposit of academic publications, such as academic journal articles. Deposit of material in such a site may be mandatory for a certain group, such as a particular university's doctoral graduates in a thesis repository, or published papers from those holding grants from a particular government agency in a subject repository, or, sometimes, in their own institutional repository. Or it may be voluntary, as usually the case for technical reports at a university. (Excerpt from Wikipedia article: Repository)