000 00333nam a2200133Ia 4500
008 230919s9999 xx 000 0 und d
082 _a384.55 VIS
100 _aViswanathan, Thiagarajan
245 0 _aTelecommunication Switching Systems And Networks
260 _aNEW DELHI
260 _bPHI
260 _c2011
300 _axx,583
999 _c173276
_d173276