%0 Journal Article
%A N. V. Medvedev
%T A~certain method of finding periodic solutions of a~system of differential equations
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1968
%P 51-55
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1968_7_a7/
%G ru
%F IVM_1968_7_a7