it can be challenging to locate gray literature sources, including conference papers and guidelines. Most databases such as MEDLINE do not index gray literature publications, guidelines, or best practices that are not published in the journal literature. ... Both Google Scholar and Scopus, however, index a variety of types of gray literature. This review discusses the search functionality and search options in both tools for finding gray literature publications, with a focus on conference papers. To read the full article, log in using your NHS OpenAthens details