Heldman, Robert K..
Telecommunications Management Planning : ISDN Networks. Products and Services / Heldman Robert K.. - Blue Ridge Summit, PA : TAB Books, 1987. - XVIII, 734 s.: il.; 24 cm.
0830628649
Telecommunications Management Planning : ISDN Networks. Products and Services / Heldman Robert K.. - Blue Ridge Summit, PA : TAB Books, 1987. - XVIII, 734 s.: il.; 24 cm.
0830628649