000 00296nam a2200109Ia 4500
008 230411s9999 xx 000 0 und d
082 _a621.3857
_bVIS
100 _aVISHWANATHAN (Thiagara Jan)
245 0 _aTelecommunication Switching Systems and Networks
260 _bPHI
_aNEW DELHI
942 _cBB
999 _c8091
_d8091