%0 Journal Article
%A A. F. Andreev
%T The exceptional direction of an $n$th order system at a stationary point
%J Differencialʹnye uravneniâ
%D 1974
%P 187-194
%V 10
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1974_10_2_a0/
%G ru
%F DE_1974_10_2_a0