%0 Journal Article
%A G. N. Petrovskiǐ
%T Certain properties of generalized $\phi$-invariant systems of linear differential equations
%J Differencialʹnye uravneniâ
%D 1974
%P 258-264
%V 10
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1974_10_2_a9/
%G ru
%F DE_1974_10_2_a9