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.
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.
You can search for articles using only the DOI. Use the Find It! Citation Linker or LibKey.io
Search by DOI in Find It! Citation Linker
Search by DOI in LibKey
