%0 Journal Article
%A A. P. Sadovskii
%T Focal values of a cubic system of nonlinear oscillations
%J Differencialʹnye uravneniâ
%D 1992
%P 1122-1127
%V 28
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1992_28_7_a2/
%G ru
%F DE_1992_28_7_a2