%0 Journal Article
%A R.A. NORMAN
%T Dehn's Lemma for Certain 4-Manifolds.
%J Inventiones mathematicae
%D 1969
%P 143-147
%V 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1969__7_141958/
%F IM_1969__7_141958