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 Formal systems of linear differential equations and their solutions in the form of normal and subnormal seriesD. P. Kostomarov 137 Solution by an operational method of certain differential equations and systems of differential equations with retarded argumentP. A. Murav'ev 157 Radicals of associative rings. IV. A. Andrunakievich 179 On the maximum of the conformal radius of the fundamental region of a given groupS. A. Gel'fer 213 Conditions for the representability of a harmonic function by Green's formula in a multiply-connected regionG. Ts. Tumarkin, S. Ya. Havinson 225 Sufficient conditions for the existence of exactly $n$ limit cycles for the system $\dfrac{dx}{dt}=y$, $\dfrac{dy}{dt}=F(y)-x$M. I. Voilokov 235 The mapping of the planes of a three-dimensional Euclidean space onto oriented curves of the third order on a Euclidean planeZ. A. Skopets 245 On perfect forms in six variablesV. S. Vladimirov 263 Some questions in the general theory of radicalsSulin'skii 273 Rarefied classes of sets admitting $F_\sigma$ coveringsA. V. Gladkii 287