International telephone service : network management, traffic engineering : recommendations E.401-E.543
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International telephone service : network management, traffic engineering : recommendations E.401-E.543
(Yellow book : VIIth Plenary Assembly, Geneva, 10-21 November 1980 / CCITT, The International Telegraph and Telephone Consultative Committee, v. 2 ; fasc. 2-3)
International Telecommunication Union, 1981
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