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 Ordinary Differential Equations The Generalized Normal Form and Formal Equivalence of Systems of Differential Equations with Zero Approximation $(x_2^3,-x_1^3)$V. V. Basov 1011 On the Simultaneous Instability of Exponential Exponents of Linear Differential SystemsN. A. Izobov 1023 Lyapunov Stability and Orbital Stability of Dynamical SystemsB. S. Kalitin 1033 An Extension of the Representation Space of the Group Admitted by a System of Ordinary Differential EquationsA. N. Kusyumov 1043 The Milne Problem for a Periodic MediumM. G. Muradyan 1050 Lyapunov Stability of Measure Driven Impulsive SystemsF. L. Pereira, G. N. Silva 1059 Semialgebraic Integrability of Algebraic Differential EquationsS. L. Sobolevskii 1068 Normal-Size Limit Cycles of Quadratic Systems with a Structurally Unstable FocusL. A. Cherkas, I. L. Shevtsov 1076 Partial Differential Equations Transformation Operators and Boundary Value ProblemsI. I. Bavrin, O. E. Yaremko 1085 On Spectral Problems in Energy Spaces on Composite Manifolds with Singular Geometry of the Blocks: IIE. G. D'yakonov 1096 How to Approximate Solutions of Variational Inequalities with Monotone Mappings in a Banach Space If the Data Are Known ApproximatelyI. P. Ryazantseva 1108 The Homotopy Classification of Three- and Four-Dimensional Analogs of the Cauchy–Riemann SystemA. T. Uss 1118 Short Communications Analogs of Classical Boundary Value Problems for a Second-Order Differential Equation with Deviating ArgumentA. A. Andreev 1126 Exact Closed-Form Solutions of Some Nonlinear Differential EquationsI. D. Dubinova 1129 Potentiality Conditions for Partial Differential Equations with Deviating ArgumentsI. A. Kolesnikova 1131 Integral Representations for a Second-Order System with a Supersingular PointA. B. Rasulov 1133 A Remark on the Existence Interval of the Solution of the Cauchy ProblemV. V. Filippov 1137 An Estimate of the Number of Periodic Solutions of the Abel EquationO. G. Hudayberenow, N. O. Hudaywerenow 1140 Chronicle Seminar on Nonlinear Dynamics and Control Problems at Moscow State University 1143