%0 Journal Article
%A A. I. Budkin
%T Idempotents in the semigroup of quasivarieties of torsion-free groups
%J Matematičeskie zametki
%D 1990
%P 21-25
%V 47
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a2/
%G ru
%F MZM_1990_47_5_a2