%0 Journal Article
%A I. T. Kiguradze
%T The periodic boundary value problem for a two-dimensional differential system
%J Differencialʹnye uravneniâ
%D 1977
%P 996-1007
%V 13
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_6_a3/
%G ru
%F DE_1977_13_6_a3