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The abstract or introduction to a literature review may state the authors' intention to survey or analyze the literature on a particular topic.
Literature reviews do not present original data (data that has not already been published elsewhere) or generally describe specific research methods in detail.
Note: Many primary research articles include short section that reviews pertinent scientific literature as background for the paper. This isn't the same thing as a literature review or review article, which is entirely devoted to a summary of primary articles.
In BIOSIS, literature reviews are identified under the Document Information field of the full article record: