00305nam a2200133Ia 45000030006000000080041000060400015000471000029000622450032000912500010001232600009001335460012001420050017001540STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGore Marvin; Stubbe John  aElements of system analysis  aThird  c1983  aEnglish20220125160209.0