00285nam a2200109Ia 4500008004100000041001200041100001700053245006800070260000600138650000600144700002500150221030s9999    xx            000 0 und d  aEnglish  aR. Schaumann 0aDesign of Analog Filterscby R. Schaumann, M. E. Van Valkenburg  c0  aB  aM. E. Van Valkenburg