Here’s a quick guide to the anatomy of a PubMed/Medline citation :
Authors = Pensato U, Matteo E, Cevoli S. Article Title = The unforgivable curse of Harry Potter's thunderclap headaches. Journal Title Abbreviation = Headache (short for Headache) Year/date of publication = 2021 September Volume(Issue) : Pages = 61(8):1287-1290. Volume = 61 Issue = 8 Page Numbers = 1287-1290 PubMed Identifier = PMID: 34510446
Digital Object Identifier = DOI = 10.1111/head.14205
The PubMed IDis the magic key when trying to find full-text.
The PubMed Identifier, or PMID, is like a social security number for each and every article listed in Medline, or PubMed. No other citation has the same PMID. This makes the PMID Number a very useful tool in finding the article again. It’s also a very useful tool for finding the full-text or ordering it from another library.
The Digital Object Identifieris persistent and strives to always arrive at some version of the document wherever it moves around the web.
Library staff should be able to sort out the specifics. Although we can often verify incomplete citations, it is helpful to give us as much citation info as possible when requesting articles.