%0 Journal Article
%A K.K.H. Butler
%A R. Brandon
%A D.W. Hardy
%A G. Markowsky
%T Cardinalities of D-classes in Bn.
%J Semigroup forum
%D 1972
%P 341-344
%V 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1972__4_133914/
%F SF_1972__4_133914