000 00277nam a2200121Ia 4500
008 241124s9999 xx 000 0 und d
100 _aSingh, R.P.;Sapre, S.D.
245 0 _aCommunication Systems
260 _bTata McGraw Hill
260 _c2000
300 _a592
942 _cBK
999 _c1771
_d1771