%0 Journal Article
%A A.H. Clifford
%T The free completely regular semigroup on a set.
%J Semigroup forum
%D 1979
%P 87-92
%V 18
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1979__18_134344/
%F SF_1979__18_134344