00322nam a2200133Ia 4500008004100000041000800041082001600049100001300065245003000078260002800108300000800136365001600144700002800160230612s9999    xx            000 0 und d  aeng  a621.392 GOP  aGopal M.  aSignals And Linear System  c1989bWiley Publication  a647  cRs.b290.50  aGopal M. & Nagrath I.J.