%0 Journal Article
%A V. Kh. Froim
%T Linear systems of first-order partial differential equations with semiregular degeneration on a hyperplane
%J Differencialʹnye uravneniâ
%D 1981
%P 373-382
%V 17
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1981_17_2_a19/
%G ru
%F DE_1981_17_2_a19