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- s.l : International Thomson Publishing Ltd, 1991.
- v. : ilus ; 28 cm.
V.18 No.10 The professional syatems,tecnology and industry magazine. Telecom 91 show issue: Telecoms in the 1990s.
V.18 No.10 The professional syatems,tecnology and industry magazine. Telecom 91 show issue: Telecoms in the 1990s.