%0 Journal Article
%A N. Knox
%T The inverse hull of the free semigroup on a set X.
%J Semigroup forum
%D 1978
%P 345-354
%V 16
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1978__16_134292/
%F SF_1978__16_134292