%0 Journal Article
%A P. Weil
%T Some results on the dot-depth  hierarchy.
%J Semigroup forum
%D 1993
%P 352-370
%V 46
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1993__46_1_135242/
%F SF_1993__46_1_135242