%0 Journal Article
%A P. Goralcik
%A V. Koubek
%T Universal coextensions within a variety.
%J Semigroup forum
%D 1997
%P 92-99
%V 54
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1997__54_2_135509/
%F SF_1997__54_2_135509