%0 Journal Article
%A B. S. Kruglikov
%T On an invariant of the characteristic distribution
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1995
%P 816-817
%V 50
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1995_50_4_a6/
%G en
%F RM_1995_50_4_a6