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 Partial Differential Equations Smoothness of solutions of a problem with an oblique derivativeK. I. Bazyk 3 On the Cauchy problem for harmonic functionsA. V. Bitsadze 11 A fourth-order evolution equation encountered in underwater acoustics of a stratified fluidS. A. Gabov, B. B. Orazov, A. G. Sveshnikov 19 Boundary value problems for a class of fourth-order equations of mixed typeT. D. Dzhuraev, M. Mamazhanov 25 Stabilization of means with respect to time of the solution of the Cauchy problem for a singular hyperbolic equationV. N. Denisov 31 Fundamental mixed boundary value problem for elliptic systems in the planeN. A. Zhura 44 The Bitsadze–Samarskiǐ problem for equations of mixed typeM. M. Zainulabidov 54 Solvability in the class $L_2$ of the Tricomi problem for a parabolic-hyperbolic equation with a degenerate hyperbolic partN. Yu. Kapustin 60 Boundary value problems for equations of mixed type containing a mixed derivativeA. G. Kuz'min 66 The behavior of eigen- and associated functions of the Schrödinger operator at the point of discontinuity of the potentialN. M. Mahmedzhanov, V. V. Tikhomirov 74 An inequality connected with the solution of a differential equationE. I. Moiseev 82 The property of being an unconditional basis on a closed interval of systems of eigen- and associated functions of a quadratic pencil of nonselfadjoint differential operatorsM. Rakhimov 94 A problem with a normal derivative for an equation of mixed type with nonsmooth lines of degeneracyM. S. Salakhitdinov, Z. Kadyrov 103 Estimation of spectral density corresponding to an expansion in an $N$-multiple system of exponentialsYa. Sh. Salimov 114 Uniform equiconvergence of expansions in a system of exponentials with associated functions, and trigonometric Fourier seriesT. A. Samarskaya 125 Fractional powers of a differential operator with singularityV. S. Serov 134 Asymptotic behavior of solutions of singular integral equationsA. P. Soldatov 143 Characteristic problem for a class of second-order hyperbolic systems with parabolic degenerationS. S. Kharibegashvili 153 Short Communications An analogue of the Tricomi–Neumann problem for an equation of parabolic-hyperbolic typeS. Dauenov 165 The basis property of a trigonometric system of functionsG. G. Devdariani 168 The basis property of a system of functionsG. G. Devdariani 170 A nonlocal problem for partial differential equationsZ. A. Nakhusheva 171 Approximate solution of two-dimensional Abel type integral equationsTeng Meng Yan 175 A problem of Riemann–Hilbert type for a degenerate elliptic system of first-order equationsKh. R. Shukurov 176