%0 Journal Article
%A Yu. M. Vazhenin
%A B. V. Rozenblat
%T Decidability of the positive theory of a~free countably generated semigroup
%J Sbornik. Mathematics
%D 1983
%P 109-116
%V 44
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1983_44_1_a5/
%G en
%F SM_1983_44_1_a5