On the modified boundary value problem of de la Vallée-Poussin for nonlinear ordinary differential equations.
On two-point boundary value problems for systems of higher-order ordinary differential equations with singularities.
On a multipoint boundary value problem for linear ordinary differential equations with singularities
A criterion for the unique solvability of and sufficient conditions for the correctness of the modified Vallèe-Poussin problem are established for the linear ordinary differential equations with singularities.
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