"That which is produced on all levels of government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers." (Fourth International Conference on Grey Literature, Washington, DC, October, 1999)
Grey literature includes:
Conference papers and proceedings can be very difficult to find:
Research reports contain the results of research projects, investigations, and surveys, and are usually published by the funder or the body undertaking the research. They can be found by searching the websites of subject associations and research organizations, in addition to library catalogues and databases.