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 People of Soviet science Nikolaǐ Nikolaevič Bogoljubov (on the occasion of his 70th birthday)V. S. Vladimirov, N. P. Erugin, Yu. A. Mitropol'skii, O. S. Parasyuk 1347 Review articles Differential and integral equations in YugoslaviaM. Bertolino 1360 Ordinary Differential Equations The reduction principle for a singularly perturbed systemYa. S. Baris 1390 Kinematic similarity of linear almost periodic systemsV. I. Varlamov 1395 Construction of a polynomial basis of comitants of a differential systemN. I. Vulpe 1399 Stability of trajectories that do not leave the neighborhood of a homoclinic curveB. F. Ivanov 1411 Boundedness of solutions of a Liénard differential equationI. A. Malysheva 1420 Averaging method for differential inclusions and its application to optimal control problemsV. A. Plotnikov 1427 Exponential dichotomy of an invariant torus of dynamical systemsA. M. Samoilenko, V. L. Kulik 1434 An averaging principle and stability of differential equations with a small parameterE. P. Sobolevskii 1444 Solvability conditions for a de la Vallée Poussin boundary value problemO. T. Tskhadaya 1450 A two-point de la Vallée–Poussin problemB. L. Shekhter 1457 Partial Differential Equations Inequalities for differential polynomials with variable coefficientsG. G. Kazaryan 1468 Investigation of boundary value problems for an equation of mixed type with a family of characteristics that cross the line of degeneracy twiceA. G. Kuz'min 1478 Qualitative properties of solutions of a mixed problemV. F. Ral'chenko 1491 Integral-Differential Equations The Bubnov–Galerkin method for construction of periodic solutions of a Volterra type integro-differential equationA. M. Samoilenko, O. D. Nurzhanov 1503 Short Communications Classical solvability of the first boundary value problem for a parabolic equation in the case when the data of the problem depend continuously on the timeV. P. Anosov 1518 Existence and continuous dependence of solutions of boundary value problemsA. Ya. Lepin 1520 The WKB method for a system of Schrödinger equations and the order of its accuracy in the case of characteristics of variable multiplicityA. G. Prudkovskii 1522 The dimension of the space of solutions of power growth for a class of overdetermined elliptic systemsD. Safarov 1526 A boundary value problem for an equation of order $2m+1$N. A. Chuesheva 1529