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 The reducibility of multifrequency systems of differential equations with summable seriesE. A. Grebenikov, F. K. Vaskan 403 Optimal realization of a given process by a discontinuous exit signal of a transmission systemS. T. Zavalishchin 412 The stabilization of linear systems with stochastic propertiesI. Ya. Kats 420 On the theory of Painlevé's equationsN. A. Lukashevich 425 Conditional stability on a finite interval of timeS. S. Belyavsky 431 Certain boundary value problems with conditions at infinityÈ. G. Khalikov 435 Almost differentiability, with respect to parameters, of the solutions of a certain differential equationN. A. Ivanov 443 Sufficient conditions for the absence of integral cycles for dynamical systems on manifoldsV. S. Medvedev 454 Behavior of solutions in the large of a certain automatic control systemM. A. Balitinov 467 An application of Galerkin's method to the integration of systems of nonlinear ordinary equationsÈ. I. Kucherenko 475 Stokes multipliers for various systems of linear differential equations. IV. R. Smilyanskii 483 The expansion in principal functions of a nonselfadjoint differential operator of order $2n$ with spectral singularitiesG. M. Kesel'man, V. È. Lyantse 497 Selfadjointness of operators that are generated by the Schrödinger equation and by inhomogeneous boundary conditions on a part of the boundaryV. V. Barkovskii 513 The representability of boundary value problems in the form of systems of section-problemsYu. A. Dement'ev 525 A solution of the stationary problem of the theory of heat conductivity for wedge-shaped bodies with a boundary condition of the third kindB. A. Vasil'ev 531 The summability of Fourier series for functions from $L_p$ in terms of eigenfunctionsSh. A. Alimov 538 A certain method of constructing the solution of an integral equation of the first kindS. I. Mel'nik 548 Short Communications The relative distribution of the solutions of two stationary linear differential systemsYu. S. Bogdanov, A. F. Naumovich 552 On the generalization of a certain theorem of N. N. Bogoljubov on averagingHoang Van Tao 555 Parametric functions of several matrices and of a countable set of matricesV. N. Laptinskii 558 Theorems on the estimation of the invariant $A_1$ of the characteristic equation for an $n$th order linear homogeneous differential equation with $\omega$-periodic coefficientsG. A. Los' 561 A solution of the stability problem for a system of linear differential equations with $\pi$-periodic coefficients by means of the $\pi /4$-characteristic equationG. A. Los' 565 The method of differentiation with respect to a parameter as applied to the problem of determining periodic solutions of differential equationsL. N. Karmov 569