000 00263nam a2200097Ia 4500
008 190703s9999 xx 000 0 und d
100 _aVISWANATHAN,T
245 0 _aTELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS
260 _aNEW DELHI
_bPEARSON
_c0
942 _cBB
_2DDC
999 _c6343
_d6343