Blue book : CCITT, IXth Plenary Assembly, Melbourne, 14-25 November 1988
Internationa Telecommunication Union
CCITT, International Telegraph and Telephone Consultative Committee
International Telecommunication Union 1989 Blue book : CCITT, IXth Plenary Assembly, Melbourne, 14-25 November 1988 vol. 7 ; fasc. 7-3
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