00272nam a2200109Ia 4500008004100000041001200041100002000053245005900073260000600132650000600138700001800144221030s9999    xx            000 0 und d  aEnglish  aA. V. Oppenheim 0aSignals and Systemscby A. V. Oppenheim, A. S. Willsky  c0  aB  aA. S. Willsky