%0 Journal Article
%A Yukio Matsumoto
%A Gerard A. Venema
%T Failure of the Dehn Lemma on Contractible 4-Manifolds.
%J Inventiones mathematicae
%D 1979
%P 205-218
%V 51
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1979__51_142630/
%F IM_1979__51_142630