000 00312nam a2200121Ia 4500
999 _c21671
_d21671
020 _a9780201565423
100 _aJan Van Duuren
245 _aTelecommunication Networks and Services
260 _c1992
_bADDISON WESLEY
_aNew York
300 _axi+212
700 _aPeter Kastelein
_eFrits C Schoute
942 _cREF