00272nam a2200121Ia 45000030006000000080041000060400015000471000023000622450027000852600009001125460012001210050017001330STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aSimmons George, F.  aDifferential equations  c1974  aEnglish20220125165943.0