%0 Journal Article
%A P. P. Zabreiko
%A Nguen Van Min
%T The group of characteristic operators and its applications in the theory of linear ordinary differential equations
%J Doklady Akademii Nauk
%D 1992
%P 24-28
%V 324
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_324_1_a3/
%G ru
%F DAN_1992_324_1_a3