Telephone network and ISDN - operation, numbering, routing and mobile service : recommendations E.100-E.333
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Telephone network and ISDN - operation, numbering, routing and mobile service : recommendations E.100-E.333
(Blue book : CCITT, IXth Plenary Assembly, Melbourne, 14-25 November 1988, vol. 2 ; fasc. 2-2)
International Telecommunication Union, 1989
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