00271nam a2200109Ia 4500008004100000082001600041100001700057245003700074250001200111260002700123300001100150150201s2012    xx            000 0 und d  a621.38bTOM  aTomasi,Wayne  aelectronic communication systems  a5th Ed.  bPearsonaN.Delhic2012  a1115p.