Supplemental search methods include strategies that explore credible content, such as:
1. Grey literature: includes credible white papers and other reports, dissertations and theses not published in commercial journals or books.
2. Citation relationships:
3. Pay attention to:
4. Hand searching: a physical copy of a published journal can reveal content excluded from the indexing of an online journal. This method is handy for elusive topics with little obvious literature in online databases or indexes, e.g. PubMed, and ERIC.
4. Clinical Trials registries often report on content not reflected in the published literature. The US Government and the World Health Organization provide clinical trials with searchable registries.
5. Direct author contact is useful for
Contact information is found in a variety of ways: in online articles, in databases as part of the article data, searching on research instrument information in a database, accessing institutional contact lists or websites and through professional sites such as LinkedIn.
Grey literature is not published in the traditional sense and includes content such as: clinical trial data, government documents, theses, conference proceedings
Where to Find Grey Literature
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