00312nam a2200121Ia 45000030006000000080041000060400015000471000024000622450066000862600009001525460012001610050017001730STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aBergman, S.; Others  aContributions to the theory of partial differential equations  c1954  aEnglish20220125165946.0