%0 Journal Article
%A V. Koubek
%T Universal expansion of semigroup varieties by regular involution.
%J Semigroup forum
%D 1993
%P 152-159
%V 46
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1993__46_1_135227/
%F SF_1993__46_1_135227