%0 Journal Article %A G. N. Petrovskiǐ %T Orthogonally similar systems of linear differential equations %J Differencialʹnye uravneniâ %D 1983 %P 1823-1826 %V 19 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_10_a29/ %G ru %F DE_1983_19_10_a29