000 00297nam a2200121Ia 4500
008 230303s9999 xx 000 0 und d
041 _aeng
082 _a621.3857 VAL
100 _aValdar
245 _aUnder Standing Telecommunications Networks.
260 _aNew Delhi
_bT.H.M. D
365 _cRS
999 _c182360
_d182360