%0 Journal Article
%A G.M.S. Gomes
%A J.M. Howie
%T On the ranks of certain semigroups of order-preserving  transformations.
%J Semigroup forum
%D 1992
%P 272-282
%V 45
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1992__45_3_135191/
%F SF_1992__45_3_135191