%0 Journal Article
%A Z. Hedrlin
%A J. Kastl
%T On extensions onto sub-semigroups of semigroups with two generators.
%J Semigroup forum
%D 1971
%P 86-88
%V 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1971__3_133850/
%F SF_1971__3_133850