%0 Journal Article
%A R.J. Warne
%T On the structure of semigroups which are unions of groups.
%J Semigroup forum
%D 1972
%P 323-330
%V 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1972__5_133949/
%F SF_1972__5_133949