000 00284nam a2200121Ia 4500
008 241124s9999 xx 000 0 und d
100 _aViswanathan Thiagarajam
245 0 _aTelecommunication Swithing System & Networks
260 _b-
260 _c0
300 _a583
942 _cBK
999 _c10274
_d10274