%0 Journal Article
%A G. Baumslag
%A Y. Roitberg
%T Groupes with free 2-generator subsemigroups.
%J Semigroup forum
%D 1982
%P 135-144
%V 25
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1982__25_134568/
%F SF_1982__25_134568