00297nam a2200121Ia 4500008004100000041001200041082001800053100001400071245003000085260003000115300001100145650001900156231217s9999    xx            000 0 und d  aEnglish  a629.8  VER  R  aVerma S N 0aAutomatic control systems  c1989bNew Delhi : Khanna,  aiv+559  aControl system