%0 Journal Article
%A I. Berstein
%T On co-groups in the category of graded algebras
%J Matematika
%D 1966
%P 32-44
%V 10
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAT_1966_10_4_a1/
%G ru
%F MAT_1966_10_4_a1