000 00278nam a2200109Ia 4500
008 230411s9999 xx 000 0 und d
082 _a621.3857
_bVAL
100 _a Valdar
245 0 _aUnder Standing Telecommunications Networks.
260 _bT.H.M. D
_aNew Delhi
942 _cBK
999 _c3507
_d3507