%0 Journal Article
%A J.P. Troallic
%A G. Hansel
%T Extension properties  of WS-groups.
%J Semigroup forum
%D 1992
%P 63-70
%V 45
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1992__45_3_135172/
%F SF_1992__45_3_135172