000 00267nam a22001097a 4500
082 _a621.382
100 _aTHIAGARAJAN VISWANATHAN
245 _aTELECOMMUNICATION SWITCHING SYSTEMS AND NETWORK
260 _aNEW DELHI
_bPHI
_c2015
300 _aXX, 620P
942 _cBK
999 _c8634
_d8634