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 Oscillatory properties of solutions of canonical equationsV. A. Yakubovich 3 On the existence of a periodic solution of a third-order non-linear differential equationÈ. M. Vaisbord 43 On the approximation of almost periodic functions with bounded spectrumE. A. Bredikhina 59 Topological classification of neighborhoods of a singularity in $n$-spaceD. M. Grobman 77 Layer-extremal groupsYa. D. Polovitskii 95 On a method of studying a differential equation of infinite orderYu. F. Korobeinik 107 The equivalence of topological spaces in primitive algebra classesT. M. Baranovich 129