%0 Journal Article
%A W. Williams
%A I. Levi
%T Normal semigroups of partial one-to-one transformations II.
%J Semigroup forum
%D 1991
%P 344-356
%V 43
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1991__43_3_135121/
%F SF_1991__43_3_135121