%0 Journal Article %A M. Kh. Lantsman %T Formal representations of solutions of a class of linear homogeneous differential equations %J Differencialʹnye uravneniâ %D 1984 %P 398-408 %V 20 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1984_20_3_a4/ %G ru %F DE_1984_20_3_a4