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 Review articles Functional-differential equationsN. V. Azbelev, L. F. Rakhmatullina 771 Ordinary Differential Equations Strictly positive periodic solutions of a nonlinear ordinary differential equationB. M. Arkhipov, A. Ya. Khokhryakov 798 Classification of polynomial systems with respect to birational transformations. IL. A. Beklemisheva 807 The existence of limit cycles of the equation $(1+x)yy'=-P_4(x)-P_2(x)y+\delta y^2$ in a singular caseG. M. Buldyk 817 The growth of meromorphic solutions of second order differential equationsA. A. Gol'dberg 824 Simple cycles in relay-sampled data systemsV. A. Gustomesov 830 Concomitants of a system with quadratic nonlinearitiesBularas Driss, M. N. Popa 835 The boundedness of the solutions of a certain multidimensional system in the critical case of one zero root and two pure imaginary roots. IIN. N. Kushkov 843 The behavior of the solutions in the case where the transformation of the argument depends on the solutionV. P. Skripnik 853 Boundary value problems for differential equations with operator coefficients that depend on a parameter. II. Solvability and properties of solutionsN. J. Yurchuk 859 Partial Differential Equations The uniqueness of the expansions in eigenfunctions of the Schrödinger operatorP. I. Achilov 871 Unboundedness of the solutions and a comparison theorem of Sturm type for higher order parabolic systems on the planeL. M. Kuks 878 Fundamental solutions of parabolic systems with discontinuous coefficients, and their applications to boundary value problems. IVM. I. Matiichuk 885 An approach to the solution of ill-posed problemsP. E. Sobolevskii, È. A. Shteynvil 900 Short Communications Periodic solutions of linear completely integrable systemsL. N. Gaishun 905 High order optimality conditions in a class of problems with constraints on the ends of the trajectoriesS. Ya. Gorokhovik 908 On solutions of a singular Cauchy problemA. E. Zernov 912 Formulas for the mutual expansion of cylindrical and spheroidal wave functionsV. T. Erofeenko 915 The dependence on the parameter of the structure of the solutions on a toroidal invariant surfaceE. K. Ershov 919 Polynomial solutions of algebraic differential equationsP. Lazov, D. Dimitrovski 922 Asymptotic behavior of the solutions of linear difference equations with constant coefficientsD. O. Melkumyan 926 Necessary and sufficient conditions for the solvability of a multipoint boundary value problem for a system of first order ordinary differential equationsV. D. Ponomarev 929 Eigenvalues of certain integral operatorsA. G. Ramm 932 Isolated periodic solutions of certain differential equationsA. E. Rudenok 935 A criterion for the harmonicity of polynomialsS. G. Samko 938 Some properties of the solutions of linear differential equations with asymptotically almost periodic coefficientsD. N. Cheban 940 On the problem of the homotopy classification of elliptic systems with eight variablesV. N. Chernomaz 943 People of Soviet science Vladimir Aleksandrovič Il'in (on the occasion of his fiftieth birthday)A. V. Bitsadze, V. S. Vladimirov, N. P. Erugin, S. M. Nikol'skii, A. A. Samarskii, A. N. Tikhonov 947