%0 Journal Article
%A N. V. Medvedev
%T An~existence principle for a~periodic solution of a~differential equation in Banach space
%J Matematičeskie zametki
%D 1968
%P 105-111
%V 4
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1968_4_1_a12/
%G ru
%F MZM_1968_4_1_a12