00299nam a2200121Ia 45000030006000000080041000060400015000471000027000622450050000892600009001395460012001480050017001600STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aSamarski, A.A.; Others  aColection of problems on mathematical physics  c1964  aEnglish20220125170022.0