%0 Journal Article
%A B. M. Arkhipov
%T A nonlinear periodic boundary value problem for an equation and a system of equations of the second order
%J Differencialʹnye uravneniâ
%D 1969
%P 456-462
%V 5
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_3_a4/
%G ru
%F DE_1969_5_3_a4