DOI = Digital Object Identifier. It is a stable identifier that does not change, unlike a URL.
You can often find DOI at the top of scholarly articles. Most citations require a DOI if available.
A DOI begins with a 10. or 12.---- For example: 10.1016/j.foodres.2018.05.072
Occasionally, the DOI will be written as a link with a https. The https is not part of the DOI.
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LibKey DOI and PMID search
