Q. What is grey literature?

Grey literature or gray literature refers to print and electronic documents that are not available through commercial publishing but may be useful or necessary to consult when attempting to create comprehensive documents like systematic reviews, meta-analyses, and guidelines. Examples of gray literature include conference proceedings, statistics, documents from professional organizations, grants, theses & dissertations, patents, and white papers. For guidance on searching grey literature in the health sciences, See the Health Sciences Grey Literature Research Guide.