%0 Journal Article
%A Yu. S. Bogdanov
%T Estimates of generalized characteristic numbers of differential systems
%J Differencialʹnye uravneniâ
%D 1966
%P 927-933
%V 2
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1966_2_7_a6/
%G ru
%F DE_1966_2_7_a6