%0 Journal Article
%A Z. S. Batalova
%A N. A. Ezhevskaya
%T The structure of the phase space of the Duffing equation
%J Differencialʹnye uravneniâ
%D 1989
%P 1270-1271
%V 25
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1989_25_7_a24/
%G ru
%F DE_1989_25_7_a24