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.
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