00430nam a2200145Ia 4500100001400000942000700014654001400021245005600035260003400091082000800125300000800133546001200141999001700153952011400170  aElsgolts   cBK  aEquations  aDifferential Equations & the Calculus of Variations  bMir  PublishersaMoscowc1973  a515  a440  aENGLISH  c25368d25368  001040708AFTaCRCEbCRCEd2023-03-17g8.00iP.P.H.5602l0o515 pAFT1330r2023-03-17v8.00w2023-03-17yBK