General tariff principles : charging and accounting in international telecommunications services : recommendations of the series D
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General tariff principles : charging and accounting in international telecommunications services : recommendations of the series D
(Yellow book : VIIth Plenary Assembly, Geneva, 10-21 November 1980 / CCITT, The International Telegraph and Telephone Consultative Committee, vol. 2 ; fasc. 2-1)
International Telecommunication Union, 1981
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