%0 Journal Article
%A S. V. Zelenov
%T Zelmanowitz density theorem for rings graded by semigroup
%J Fundamentalʹnaâ i prikladnaâ matematika
%D 2001
%P 373-385
%V 7
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FPM_2001_7_2_a4/
%G ru
%F FPM_2001_7_2_a4