Within bibliographic references (<nlm-citation> and <citation>), International Standard Series Number, an eight-character code that provides title identification for serial publications. Such numbers may be assigned to one or more versions of a journal by the ISDS (International Serials Data System) in Paris or by one of the national ISDS Centers.
<!ELEMENT issn (#PCDATA %issn-elements;) >
Text, numbers, or special characters
<citation> Citation; <product> Product Information; <related-article> Related Article Information
No sample is available at this time.
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