%0 Journal Article
%A A. P. Sadovskii
%T Formal orbital normal forms of two-dimensional systems with nonzero linear part
%J Differencialʹnye uravneniâ
%D 1985
%P 1509-1516
%V 21
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1985_21_9_a5/
%G ru
%F DE_1985_21_9_a5