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 Ordinary Differential Equations Investigation of the problem of the center and focus in one caseA. F. Andreev, P. D. Khody-Zade 187 The highest $\sigma$-exponent of linear differential equationsE. A. Barabanov 197 Oscillatory properties of solutions of a nonlinear system of second-order ordinary differential equationsA. I. Bulgakov, B. A. Sergeev 207 The spectrum of a nonselfadjoint singular differential operatorA. P. Vinnichenko 215 Coefficient stability of systems of ordinary differential equationsA. A. Zlotnik 220 Qualitative investigation of a system in the space $\mathbf R^3$A. Ya. Kapitanov 229 Lyapunov's function and dichotomy on semiaxes of linear systems of differential equationsA. N. Kulik, V. L. Kulik 233 Typical properties of conditional exponential stability. IVV. M. Millionshchikov 241 A boundary value problem for linear differential-difference equationsS. A. Minyuk, S. N. Lyakhovets 257 Boundary value problems for differential equations, which contain a parameter, with multiple roots of the characteristic equationA. S. Pechentsov 263 Some integrable equations with a small parameter that are close to Liénard's equationG. E. Popov 274 Partial Differential Equations Nonessential sets of the Dirichlet problemN. V. Bagotskaya 279 Global solution of a first-order partial differential equation. IIY. A. Belov 288 Characteristic problem for the massive wave equationA. A. Borgardt, D. Ya. Karpenko 302 Linear equations in spaces of generalized periodic functionsA. A. Kuleshov 308 The Neumann problem for the Helmholtz operator in the exterior of a thin body of revolutionG. F. Maslennikova 316 Uniqueness of the determination of dielectric and magnetic permeabilities in an anisotropic one-dimensionally inhomogeneous mediumV. G. Romanov 325 A problem of Tricomi type for equations of mixed type with strong characteristic degenerationK. B. Sabitov 333 Weighted imbedding theorems and their application to estimates of solutions of equations of elliptic typeA. S. Fokht 337 Short Communications Attraction of solutions of an ordinary differential systemA. I. Bagrova 344 Asymptotic behavior of the solutions of higher-order ordinary differential equations with a turning pointA. B. Davydov, N. M. Matveev 347 Some properties of solutions of a class of systems of nonlinear differential equationsV. P. Zhukov 349 Asymptotic integration of hyperbolic equations with weakly nonlinear perturbationL. A. Kalyakin 351 Systems of three differential equations whose solutions do not have essentially singular pointsS. G. Kondratenya 353 Chronicle Î ñåìèíàðå ïî êà÷åñòâåííîé òåîðèè äèôôåðåíöèàëüíûõ óðàâíåíèé â Ìîñêîâñêîì óíèâåðñèòåòå 355