000 00318nam a2200121Ia 4500
008 230303s9999 xx 000 0 und d
041 _aeng
082 _a621.3857 VIS
100 _aVISHWANATHAN (Thiagara Jan)
245 _aTelecommunication Switching Systems and Networks
260 _aNEW DELHI
_bPHI
365 _cRS
999 _c191388
_d191388