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Option 4 : Gray literature
- Literature broadly is any collection of written work, but it is also used more narrowly for writings specifically considered to be an art form, especially prose fiction, drama, and poetry.
- Grey literature = gray literature is materials and research produced by organizations outside of the traditional commercial or academic publishing and distribution channels.
- Grey literature may be made available to the public, or distributed privately within organizations or groups, and may lack a systematic means of distribution and collection.
- Common grey literature publication types include reports (annual, research, technical, project, etc), working papers, government documents, white papers and evaluations.
- Organizations that produce grey literature include government departments and agencies, civil society or non-governmental organizations, academic centers and departments, and private companies and consultants.
- Ancestry approach -> refers to the systematic review of citations from studies included in the review and from review articles.
- Bibliographic databases -> it is a database of bibliographic records, an organized digital collection of references to published literature, including journal and newspaper articles, conference proceedings, reports, government and legal publications, patents, books, etc.
- Descendancy approach -> aimed at finding a pivotal early study and to search forward in citation indexes to find more recent studies (descendants) that cited the key study.
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