%0 Journal Article %A E. K. Makarov %A I. V. Marchenko %T On upward mobility of the highest exponent of a linear differential system under perturbations of the coefficients from the simplest classes with degeneracies %J Trudy Instituta matematiki %D 2017 %P 50-59 %V 25 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMB_2017_25_2_a4/ %G ru %F TIMB_2017_25_2_a4