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 Ordinary Differential Equations A formula for the frequency number of axially symmetric oscillations of rotating shellsA. G. Aslanyan, V. B. Lidskii 1355 Separation and $e$-splitting of almost periodic systemsB. F. Bylov, R. È. Vinograd 1366 Absolute stability of automatic control systems with lagP. S. Gromova, A. F. Pelevina 1375 The reduction to simplest form of a system of linear differential equations with a small parameter multiplying the derivativeV. A. Dikarev 1384 Convergence in a system of two equations with dissipationV. K. Polivenko 1390 Linear differential equations in locally convex spaces. I. Regular operators and their propertiesYa. V. Radyno 1402 Solutions of operator equations that are asymptotically stable in the sense of PoissonD. N. Cheban 1411 Partial Differential Equations The spectrum of the Tricomi problem for the Lavrent'ev–Bicadze equationT. Sh. Kal'menov 1418 Solution of some systems of partial differential equationsN. T. Stel'maschuk 1426 The principle of a minimum of a quadratic functional for a boundary value problem of heat conductionV. M. Filippov, A. N. Skorokhodov 1434 Some partial differential equations that are degenerate on a hyperplaneV. Kh. Froim 1446 A theorem on the behavior at infinity of the solutions of a partial differential equationN. N. Chaus 1454 Integral Equations and Integral-Differential The existence and uniqueness of the solution of the coagulation equationV. A. Galkin 1460 The Wiener–Hopf integral equation with a symbol that has a zero of fractional orderN. K. Karapetyants 1471 A well-posed problem for singular integral equations with a symbol that goes to zeroV. G. Maz'ya, B. A. Plamenevskii, Yu. E. Khaikin 1479 Methods for the approximate solution of some classes of linear integral equations that occur in control theoryV. V. Solodovnikov, V. F. Reutov 1487 On the numerical solution of singular integral equations of the first kindM. A. Sheshko 1493 Short Communications The limit absorption principle, the limit amplitude principle and partial radiation conditions for a boundary value problem in an $n$-dimensional layer for the Helmholtz equationA. B. Akimov, B. A. Iskenderov 1503 A remark on the principle of averaging on the whole real line for equations of neutral typeR. R. Akhmerov 1506 The existence of a knotted solution for a third order autonomous systemV. I. Bulgakov 1507 The Cauchy formula for linear equations with functional derivativesV. P. Danilovich, I. M. Koval'chik 1509 A boundedness criterion for the solutions of linear difference-differential equations with retarded argument in Banach spacesA. I. Dashevskii 1512 The integration of a Riccati equation, and the determination of a particular solution for certain equationsI. A. Dobodeych 1516 The uniqueness of the generalized solution of a certain problem in shock theoryV. A. Dobrushkin 1521 The existence of a continuous branch for the eigenfunctions of a nonlinear elliptic boundary value problemV. G. Zvyagin 1524 The asymptotic stability of self-adjustment algorithms in first order systems with lagV. R. Nosov, B. I. Prokopov 1528 Behavior of the solutions of equations with transformed argumentV. P. Skripnik 1532 The functionally invariant solutions of a second order quasilinear partial differential equationM. V. Shvetskii 1534 Letters to the Editor Letter to the editors: “On the question of the isochrony of the center of two-dimensional analytic differential systems” (Differencial'nye Uravnenija 13 (1977), no. 6, 971–980)V. V. Amel'kin 1537 Letter to the editors: “The boundedness of the infinitely continuable solutions of a system of two differential equations with quadratic right hand sides” (Differencial'nye Uravnenija 11 (1975), no. 11, 2019–2026)È. S. Shpigelman 1537