Self-Archiving is the first open access strategy identified by the Budapest Open Access Initiative-BOAI. Stevan Harnad refers to it as the "Green Road" to open access, and this term has come into common usage.
When authors make their articles freely available in digital form on the Internet, they are said to be "self-archiving" them. These articles can be either "preprints" or "postprints".
Both digital preprints and postprints are called "e-prints.“
Available in other OA vehicles, such as personal web sites, ebooks, listservs, discussion forums, blogs, wikis, RSS feeds, and P2P file-sharing networks. There will undoubtedly be many more in the future.
Grey Literature
refers to material that is not formally published, such as institutional or technical reports, working papers, business documents, conference proceedings, or other documents not normally subject to editorial control or peer review. It may be widely available yet difficult to trace.
information produced on all levels of government, academics, business and industry in electronic and print formats not controlled by commercial publishing