00291nam a2200121Ia 4500008004100000020001800041041000800059082001800067100002300085245002500108260002800133300000800161211209s2015    xx            000 0 und d  a9789332550230  aeng  a621.38223 OPP  aOPPENHEIM, ALAN V.  aSIGNALS AND SYSTEMS   bPEARSON EDUCATIONc2015  a957