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 Ordinary Differential Equations On the Aǐzerman problem for third-order time-dependent systemsN. E. Barabanov 1659 Topological classification of a quadratic system with a four-fold singular pointN. I. Vulpe, I. V. Nikolaev 1669 Rational solutions of algebraic differential equationsV. N. Gorbuzov, V. S. Nemets 1675 A criterion for the linearizability of the Riccati matrix differential equation and some properties of its solutionsM. A. Egorov 1684 On the linear systems $L^pS$ with summable perturbationsR. Conti, N. A. Izobov, R. A. Prokhorova 1689 Linear systems of differential equations that are regular on $\mathbf R$V. L. Kulik 1699 On the boundedness of trajectories of time-dependent phase systemsA. V. Savkin 1705 Partial Differential Equations Approximate groups of transformationsV. A. Baikov, R. K. Gazizov, N. H. Ibragimov 1712 Transformation groups with a function parameterT. Zh. Esirkepov 1733 Seven notes on group analysisN. H. Ibragimov 1739 The Lie–Bäcklund group of the equations of nonlinear geometric opticsV. F. Kovalev, V. V. Pustovalov, S. I. Senashov 1751 On the structure of variational equations with symmetric operator $d/dt$V. M. Savchin 1765 Group classification and invariant solutions of nonlinear polyharmonic equationsS. R. Svirshchevskii 1772 Higher integrals and symmetries of semi-Hamiltonian systemsM. B. Sheftel 1782 Integral Equations and Integral-Differential Weak invariants of local groups of transformationsYu. Yu. Berest 1796 Group analysis of the Vlasov kinetic equation. IV. F. Kovalev, S. V. Krivenko, V. V. Pustovalov 1804 Short Communications On the number of negative eigenvalues of the Schrödinger operatorSh. A. Alimov, S. A. Safaev 1818 Inverse mean value theorem for $i$th order associated functions of the Laplace operatorO. V. Kashtanov 1822 Group analysis of equations of thermal self-interaction of laser radiation in a moving mediumA. G. Kudryavtsev 1825 On the Noethericity of a discrete convolution-type equation with almost stabilizing multipliersA. I. Tuzik 1829 The Tricomi problem for the Lavrent'ev–Bitsadze system in a domain of a special formT. V. Chekmarev 1832 Sergeǐ Aleksandrovich Lomov (obituary) 1834