%0 Journal Article
%A I. E. Vitrichenko
%T On the stability in a critical case of a zero and a pair of pure imaginary roots of an $n$-th order nonautonomous nonlinear equation
%J Differencialʹnye uravneniâ
%D 1991
%P 350-354
%V 27
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_2_a20/
%G ru
%F DE_1991_27_2_a20