What is grey literature?

Grey literature is research not available through traditional commercial publishers. Instead, grey literature is available through government agencies, professional associations, research institutes and more.

Examples of grey literature are unpublished clinical trials, data sets, government and organization reports, conference proceedings, dissertations / theses, patents, preprints, etc.

Why use grey literature?

Include grey literature in evidence syntheses to reduce publication bias and Type I error.

How to find grey literature?

Grey literature is hard to find. The links on this page include some resources and techniques to find grey literature.