%0 Journal Article
%A I. Z. Manevich
%T Existence of periodic solutions of a~system of three differential operators
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1968
%P 75-76
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1968_6_a9/
%G ru
%F IVM_1968_6_a9