%0 Journal Article
%A V. P. Prokop'ev
%T The stability of the unperturbed motion in the critical case of two zero roots and a pair of pure imaginary roots
%J Differencialʹnye uravneniâ
%D 1976
%P 2009-2013
%V 12
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1976_12_11_a10/
%G ru
%F DE_1976_12_11_a10