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 Ordinary Differential Equations On the proof of the maximum principle for objects with continuous timeV. G. Boltyanskii 1747 Optimal control of a process of trajectory measurements under random perturbationsV. B. Kolmanovskii 1754 Conditions for the existence of solutions with singular initial conditions of a nonlinear system of two differential equationsS. G. Kondratenya, A. I. Yablonskii 1765 Generalized Ljapunov functions, and the theory of exceptional directionsYu. V. Malyshev 1774 Differential equations with fixed critical singular pointsI. P. Martynov 1780 Contact avoidance problem in differential games with nonlinear controlsE. F. Mishchenko, N. Satimov 1792 On the problem of the construction of equations of programmed motionsI. A. Mukhametzyanov 1798 Certain properties of the $O$-curves of first order equations with factored right-hand sideV. V. Nikonenko 1810 On the problem of the center for systems with discontinuous right-hand sidesI. I. Pleshkan, K. S. Sibirskii 1817 The almost recurrent and recurrent motions of discontinuous dynamical systemsV. F. Rozhko 1826 Partial Differential Equations The question whether nonlinear mixed problems for almost linear hyperbolic systems in the plane are well posedV. N. Gol'dberg 1831 Continuous branches of the eigenfunctions of quasilinear elliptic problemsV. S. Klimov 1845 Method of $\varepsilon$-quasisolutions for equations of the first kindO. A. Liskovets 1851 The construction of order-optimal approximate solutions of linear conditionally well-posed problemsV. N. Strakhov 1862 Diffraction of a plane sonic wave in an angular domain whose boundaries are absolutely rigid and slippery and coated thin elastic platesA. A. Tuzhilin 1875 Smoothness of generalized solutions near the vertex of a polyhedral angleA. F. Filippov 1889 Finite difference equations Existence of invariant tori for systems of difference equationsA. M. Samoilenko, D. I. Martynyuk, N. A. Perestyuk 1904 Short Communications Comparison functions for the solutions of a certain first order nonlinear differential equationG. S. Krechetov 1911 A plane mixed heat conduction problem for a wedgeL. Ya. Tikhonenko 1915 On a certain theorem of N. E. ŽukovskiǐA. Ya. Khokhryakov 1919