%0 Journal Article
%A M. A. Krasnosel'skii
%A A. I. Perov
%T On a certain principle of the existence of bounded, periodical and almost periodical solutions to systems of ordinary differential equations
%J Doklady Akademii Nauk
%D 1958
%P 235-238
%V 123
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_123_2_a5/
%G ru
%F DAN_1958_123_2_a5