%0 Journal Article %A N. A. Izobov %T The minimal exponent of a two-dimensional linear differential system %J Differencialʹnye uravneniâ %D 1977 %P 848-858 %V 13 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_5_a5/ %G ru %F DE_1977_13_5_a5