message handling system
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... CCITT, "CCITT Recommendations X.408", Message Handling Systems: Encoded Information Type Conversion Rules, CCITT, December 1988. ...
... CCITT/ISO, "CCITT Recommendations X.420/ ISO IS 10021-7", Message Handling Systems: Interpersonal Messaging System, CCITT/ISO, December 1988. ...
... CCITT/ISO, "CCITT Recommendations X.411/ ISO IS 10021-4", Message Handling Systems: Message Transfer System: Abstract Service Definition and Procedures, CCITT/ISO, December 1988. ...
... CEN/CENELEC/Information Technology/Working Group on Private Message Handling Systems, "FUNCTIONAL STANDARD A/3222", CEN/CLC/IT/WG/PMHS N 17, October 1985. ...