What is a DOI?
A DOI (digital object identifier) is a standardized unique number assigned by publishers to many (but not all) journal articles, studies, and book chapters available online.
When a DOI is included in a citation, it will be easier for a reader to locate the version of the work cited.
To find a DOI number look on the first page and in the header or footer information. The example below shows where to find the DOI in a ScienceDirect library database record.
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