"Gray Literature" is a term for writings published outside of traditional journal or book publishing or that are unpublished. Examples include government publications, doctoral dissertations or masters theses, working papers, white papers, reports, and sometimes conference papers. Below are some ways to locate these.
What are review articles? Why are they important?
"The amount of primary research is overwhelming. Review articles analyze and summarize the wide array of primary research published on a particular topic in a scholarly discipline. They filter relevant primary research—including articles, books, and data—in a specific area of inquiry to evaluate important ideas and trends. Review articles guide you to essential primary research."
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