%0 Journal Article
%A J. Barback
%T Extensions to Regressive Isols.
%J Mathematica Scandinavica
%D 1969
%P 159-177
%V 25
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1969__25_166113/
%F MS2_1969__25_166113