%0 Journal Article
%A V. D. Nguyên
%T Vibrations of nonautonomous systems with resonance, in the singular case
%J Differencialʹnye uravneniâ
%D 1968
%P 1233-1240
%V 4
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1968_4_7_a6/
%G ru
%F DE_1968_4_7_a6