%0 Journal Article %A V. A. Tyshkevich %T Asymptotic equivalence of linear differential systems with retarded argument %J Differencialʹnye uravneniâ %D 1976 %P 2039-2043 %V 12 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1976_12_11_a14/ %G ru %F DE_1976_12_11_a14