00294nam a2200121Ia 45000030006000000080041000060400015000471000019000622450053000812600009001345460012001430050017001550STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aFriedman Avner  aPartial differential equations of parabolic type  c1964  aEnglish20220125165942.0