Isdn explained worldwide explained network and applications technology
Griffins,john
Isdn explained worldwide explained network and applications technology - 3rd. ed. - Wiley
0471979058
Intergrated service digital networks
004.66 GRI
Isdn explained worldwide explained network and applications technology - 3rd. ed. - Wiley
0471979058
Intergrated service digital networks
004.66 GRI