%0 Journal Article %A E. P. Volokitin %A S. A. Treskov %T On the behavior of Lyapunov quantities of a complex focus for systems that are close to a system with a nilpotent linear part %J Differencialʹnye uravneniâ %D 1995 %P 1759-1761 %V 31 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1995_31_10_a21/ %G ru %F DE_1995_31_10_a21