%0 Journal Article
%A J.D. Lawson
%A I. Chon
%T Problems on semigroups and control.
%J Semigroup forum
%D 1990
%P 245-252
%V 41
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1990__41_2_135052/
%F SF_1990__41_2_135052