%0 Journal Article %A I. N. Sergeev %T Sharp upper bounds of mobility of the Ljapunov exponents of a system of differential equations and the behavior of the exponents under perturbations approaching %J Differencialʹnye uravneniâ %D 1980 %P 438-448 %V 16 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1980_16_3_a6/ %G ru %F DE_1980_16_3_a6