%0 Journal Article
%A M. I. Voilokov
%T A~method of estimating an upper bound of the number of periodic solutions of an autonomous system of two differential equations
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1961
%V 16
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1961_16_3_a7/
%G ru
%F RM_1961_16_3_a7