00322nam a2200133Ia 45000030006000000080041000060400015000471000016000622450049000782500010001272600022001375460012001590050017001710STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aAyres Frank  aTheory and problems of differntial equations  aFirst  bMcgraw hillc1976  aEnglish20220125165942.0