%0 Journal Article
%A E. D. Garber
%T Periodic solutions of certain non-linear differential equations
%J Doklady Akademii Nauk
%D 1967
%P 1003-1006
%V 172
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_172_5_a2/
%G ru
%F DAN_1967_172_5_a2