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ITU-T Z.321 Introduction to the extended MML for visual display terminals
ITU-T Z.331 Introduction to the specification of the man-machine interface
ITU-T Z.332 Methodology for the specification of the man-machine interface; General working procedure
ITU-T Z.333 Methodology for the specification of the man-machine interface; Tools and methods
ITU-T Q.721 Functional description of the signalling system no. 7 telephone user part (TUP)