000 00268nam a2200109Ia 4500
008 240109s2011 xx 000 0 und d
041 _aeng
082 _a620
100 _aVishwanthan T.
245 _aTelecommunication Switching System
260 _aDelhi
_bPHI
_c2011
999 _c1014710
_d1014710