000 00316nam a2200121Ia 4500
008 230303s9999 xx 000 0 und d
041 _aeng
082 _a621.3857 VIS
100 _aVISWANATHAN (THIAGARAJAN)
245 _aTelecommunication Switching Systems and Networks
260 _aNew Delhi
_bPHI
365 _cRS
999 _c177997
_d177997