000 00259nam a2200097 4500
020 _a9788120350830
100 _aTHIAGARAJAN VISWANATHAN et al
245 _aTELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS
260 _aNEW DELHI
_PPHI LEARNING
_c2015
942 _cBK
999 _c1847
_d1847