000 00315nam a22001337a 4500
020 _a9788120307131
082 _a621.38 VIS
100 _aViswanathan Thiagarajan
245 _aTelecommunication Switching Systems and Networks
260 _aNew Delhi
_bPHI
_c1999
300 _a583
650 _aP-678
942 _cBK
999 _c6318
_d6318