"Gray or grey literature has long been considered the proverbial needle in the haystack. It is commonly defined as any documentary material that is not commercially published and is typically composed of technical reports, working papers, business documents, and conference proceedings." by Brian S. Mathews in C&RL News, March 2004 Vol. 65, No. 3
"Using gray literature in preparing systematic reviews is mandatory to overcome or alleviate publication bias." by Kazem Heidari Tavasani in Searching for Trials at http://archive.today/uYqZ3
See below for more definitions and information about Grey Literature.
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