%0 Journal Article
%A E. D. DeVun
%T Semigroups with [ x] [ y] = [y][x].
%J Semigroup forum
%D 1980
%P 241-254
%V 20
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1980__20_134418/
%F SF_1980__20_134418