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 Ordinary Differential Equations Separation of motions in some classes of differential systemsS. V. Bogatyrev 923 Orbital normal forms and bifurcations of fields of linear elements in the planeI. U. Bronshtein, I. V. Nikolaev 934 Approximate controllability of two-parameter discrete systems with commuting operatorsI. V. Gaishun 939 On the number of semi-algebraic partial integrals of a class of dynamical systems with a cylindrical phase spaceM. V. Dolov, E. V. Kruglov 949 Simplest third-order differential equations of $P$-typeN. A. Lukashevich 955 Quasidifferential equations in a complete metric space under Carathéodory-type conditions. IA. I. Panasyuk 962 On a problem in sub-Riemannian geometryN. N. Petrov 973 The concept of generalized controls for functional-differential systemsV. G. Pimenov 980 A criterion for the existence of a solution with small growth of a linear inhomogeneous systemA. S. Fursov 990 Partial Differential Equations Estimates for generalized solutions of the Dirichlet problem for second-order quasilinear elliptic equations in a domain with a conical boundary pointM. V. Borsuk 1001 On exact penalty operators for elliptic variational inequalities with an obstacle inside the domainR. Z. Dautov 1008 Well-posedness of the Saffman model of a dusty gas taking into account compressibilityG. G. Doronin 1018 On the uniqueness and simultaneous determination of the coefficients, depending on the different variables, of a parabolic equationN. V. Muzylev 1026 Asymptotic solution of a problem with small obstaclesS. A. Nazarov 1031 On the error of averaging for the Steklov problem in a punctured domainS. E. Pastukhova 1042 Necessary conditions for an extremum in the case of the nondifferentiability of the state function with respect to the controlS. Ya. Serovaĭskiĭ 1055 Determination of the source and coefficients in a parabolic equation in the multidimensional caseV. V. Solov'ev 1060 The Cauchy problem for the Zakharov–Kuznetsov equationA. V. Faminskii 1070 Short Communications On the spectrum of some singular differential equationsT. S. Gadzhiev 1082 On some properties of the generalized linearized Korteweg–de Vries equationI. A. Gubanov 1084 On the analytic structure of periodic solutions of linear matrix differential equationsV. N. Laptinskii, K. Kenzhebaev, V. V. Pugin 1087 Îá îãðàíè÷åííûõ ðåøåíèÿõ ëèíåéíûõ ñèíãóëÿðíî âîçìóùåííûõ ñèñòåì â óñëîâíî óñòîé÷èâîì ñëó÷àåN. G. Panfilov 1090 Center conditions for a cubic system with four complex parametersV. G. Romanovsky 1091 Invariant orthants of bilinear systemsYu. L. Sachkov 1094 On limit cycles and separatrices of a quadratic systemR. M. Teshev, D. S. Ushkho 1096 Generalized Carathèodory existence theorems for a system of ordinary differential equationsÈ. G. Shifrin 1098