%0 Journal Article
%A D.M. Davenport
%T On power commutative  semigroups.
%J Semigroup forum
%D 1992
%P 9-20
%V 44
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1992__44_1_135126/
%F SF_1992__44_1_135126