00303nam a2200121Ia 45000030006000000080041000060400015000471000017000622450056000792600017001355460012001520050017001640STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aAmarnath, T.  aElementary course in partial differential equations  bNarosac1997  aEnglish20220125165942.0