00326nam a2200121Ia 45000030006000000080041000060400015000471000047000622450057001092600009001665460012001750050017001870STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aKrasnov, M.L.; Others; Yankovsky George Tr  aProblems and exercises in the calculus of variations  c1975  aEnglish20220125165952.0