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What is an ISSN, a DOI, or a PMID?

 These are all specific identifiers specific to an information source.

ISSN: The International Standard Serial Number (ISSN) is a unique number used to identify a printed or electronic journal title (journal).

DOI: Digital Object Identifier (DOI) is used to uniquely identify online objects such as journal articles or datasets.

PMID: PubMed Identifier (PMID) is a unique number assigned to each PubMed reference.