000 00256nam a2200109Ia 4500
020 _a9788120307131
082 _a621.382
100 _aVISWANATHAN, THIAGAWIAN
245 _aTELECOMMUNICATION SWITCHING SYSTEMS
260 _aNEW DELHI
_b PHI
_c2010
942 _cBK
999 _c7347
_d7347