%0 Journal Article %A E. A. Barabanov %T Necessary conditions for the simultaneous behavior of higher sigma-exponents of a triangular system and systems of its diagonal approximation %J Differencialʹnye uravneniâ %D 1989 %P 1662-1670 %V 25 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1989_25_10_a1/ %G ru %F DE_1989_25_10_a1