%0 Journal Article
%A M. A. Krasnosel'skii
%T The theory of periodic solutions of non-autonomous differential equations
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1966
%P 53-74
%V 21
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1966_21_3_a1/
%G en
%F RM_1966_21_3_a1