%0 Journal Article
%A V. I. Prokhorenko
%T Theorems on the smoothness of periodic solutions of differential
%J Doklady Akademii Nauk
%D 1991
%P 280-283
%V 320
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a4/
%G ru
%F DAN_1991_320_2_a4