00305nam a2200133Ia 45000030006000000080041000060400015000471000017000622450035000792500010001142600018001245460012001420050017001540STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aCopson, E.T.  aPartial differential equations  aFirst  bS.Chandc1975  aEnglish20220125165946.0