%0 Journal Article
%A Jonathan A. Hillman
%T Aspherical four-manifolds and the centres of two-knot groups.
%J Commentarii mathematici Helvetici
%D 1981
%P 465-473
%V 56
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1981__56_139880/
%F CMH_1981__56_139880