000 00301nam a2200121Ia 4500
008 221030s9999 xx 000 0 und d
041 _aEnglish
100 _aT. Vishwanathan
245 0 _aTelecommunication Switching System & Networks
_cby T. Vishwanathan
260 _c0
650 _aB
942 _cBK
999 _c17355
_d17355