%0 Journal Article
%A Yu. Yu. Berest
%T Weak invariants of local groups of transformations
%J Differencialʹnye uravneniâ
%D 1993
%P 1796-1803
%V 29
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1993_29_10_a14/
%G ru
%F DE_1993_29_10_a14