00261nam a2200109Ia 4500008004100000020001800041082001300059100002500072245002900097260001700126300000800143250402s9999 xx 000 0 und d a9789351460569 a5bSIL-O aSILBERSCHATS ABRAHAM 0aOPERATING SYSTEM CONCEPT bWILLEYc2024 a864