%0 Journal Article
%A I. T. Kiguradze
%A T. Kusano
%T On periodic solutions of higher-order nonautonomous ordinary differential equations
%J Differencialʹnye uravneniâ
%D 1999
%P 72-78
%V 35
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1999_35_1_a10/
%G ru
%F DE_1999_35_1_a10