%0 Journal Article %A N. S. Niparko %T The necessary condition of Lyapunov exponents stability of linear differential systems under degree decreasing perturbations %J Trudy Instituta matematiki %D 2008 %P 105-117 %V 16 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMB_2008_16_2_a10/ %G ru %F TIMB_2008_16_2_a10