Answered By: Corporate Communications Last Updated: Feb 18, 2016 Views: 7264
These are all specific identifiers unique to a source of information.
ISSN: International Standard Serial Number (ISSN) is a unique number used to identify a print or electronic periodical (journal) title.
DOI: A Digital Object Identifier (DOI) is used to uniquely identify objects in the digital environment, for example a journal article or data set.
PMID: PubMed Identifier (PMID) is a unique number assigned to each PubMed citation.
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