%0 Journal Article %A N. A. Izobov %T Lower Bounds for the Characteristic Exponents of a Linear Differential System with Perron Perturbations %J Differencialʹnye uravneniâ %D 2002 %P 596-602 %V 38 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2002_38_5_a2/ %G ru %F DE_2002_38_5_a2