Interconnect costing / Peter Cartwright
Information security management : BS ISO / IEC 17799:2000, BS 7799-2 and guidelines / British Standards Institution
Number portability 2001 : documentação da Conferência: Praga, 24- 26 de setembro de 2001 / org. IIR Telecoms & Technology
European telecomms regulations and policy documents / ed. CommEd Ltd