In accordance with the ISO standard 3297 International Standard Serial Number (ISSN). The ISSN consists of eight digits in Arabic numerals 0 to 9, except the last digit which is a check digit and can sometimes be an X. The ISSN has no internal meaningful elements to identify language, country, publisher. (RFC 3044: Using The ISSN (International Serial Standard Number) as URN (Uniform Resource Names) within an ISSN-URN Namespace)


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