%0 Journal Article
%A Jens Peter Reus Christensen
%T Borel Structures in Groups and Semigroups.
%J Mathematica Scandinavica
%D 1971
%P 124-128
%V 28
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1971__28_166169/
%F MS2_1971__28_166169