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The following are some of the sources consulted while putting together this guide. These may also be of interest for further information on this subject.
Grey Literature Web Conference Series
A three-part Web conference series organized by Academy Health. Recordings of the presentations and presentations slides are available.
101: Shining a White Light on Grey Literature
102: Advanced Search Strategies for Grey Literature
103: Standing out in a Sea of Grey Literature
On publication lag of conference papers
Scherer RW, Langenberg P, von Elm E. Full publication of results initially presented in abstracts. Cochrane Database of Systematic Reviews 2007, Issue 2. Art. No.: MR000005. DOI: 10.1002/14651858.MR000005.pub3.