https://app.knowbase.one/vault/rfc/docid/1144
RFC3044: Using The ISSN (International Serial Standard Number) as URN (Uniform Resource Names) within an ISSN-URN Namespace
Network Working Group S. Rozenfeld Request for Comments: 3044 ISSN International Centre Category: Informational January 2001 Using The ISSN (International Serial Standard Number) as UR...
https://app.knowbase.one/vault/rfc/docid/3556
RFC3187: Using International Standard Book Numbers as Uniform Resource Names
Network Working Group J. Hakala Request for Comments: 3187 Helsinki University Library Category: Informational H. Walravens The International ISBN Agency ...