00278nam a2200121Ia 45000030006000000080041000060400015000471000023000622450033000852600009001185460012001270050017001390STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aCharles Bettelheim  aSome basic planning problems  c1960  aEnglish20220125165622.0