On the correctness of the Dirichlet problem in a characteristic rectangle for fourth order linear hyperbolic equations.
On sufficient conditions of existence and uniqueness of periodic in a strip solutions of nonlinear hyperbolic equations.
On unique solvability of the periodic problem in the plane for linear hyperbolic equations.
On the Dirichlet problem in a characteristic rectangle for fourth order linear singular hyperbolic equations.
On some singular boundary value problems for ordinary differential equations
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