%0 Journal Article
%A I. Levi
%T Transformation semigroup diagram and the ...-relation.
%J Semigroup forum
%D 1994
%P 138-151
%V 48
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1994__48_3_135306/
%F SF_1994__48_3_135306