CCITT Draft Recommendation T.4. International Telegraph and Telephone Consultative Committee of the International Telecommunication Union. January 1981.
http://www.faqs.org/rfcs/rfc804.html
Proposed Federal Information Processing Standard: Specification for Message Format for Computer Based Message Systems. National Bureau of Standards. September 1981.
http://www.faqs.org/rfcs/rfc806.html
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