AN INDIRECT VARIATIONAL FORMULATION OF A THIRD-ORDER ORDINARY DIFFERENTIAL EQUATION AND BIRKHOFF’S EQUATIONS ArticleBudochkina S.A., Shinkarenko I.V.Lobachevskii Journal of Mathematics. Том 45. 2024. С. 4912-4924
AN INDIRECT VARIATIONAL FORMULATION OF A THIRD-ORDER ORDINARY DIFFERENTIAL EQUATION AND BIRKHOFF'S EQUATIONS ArticleBudochkina S.A., Shinkarenko I.V.Lobachevskii Journal of Mathematics. Том 45. 2024. С. 4912-4924
