Answered By: Jon Allinder
Last Updated: Dec 16, 2020     Views: 8696

A DOI ( digital object identifier) is a permanent unique string of letters, numbers, and symbols assigned by a registering agency to an electronic resource.

DOIs can be assigned to articles, books, abstracts, conference papers, etc.  

Since publishers or content owners have to pay to register items, many scholarly articles still lack DOIs. 

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