%0 Journal Article
%A Martin Scharlemann
%T Smooth spheres in IR4 with four critical points are standard.
%J Inventiones mathematicae
%D 1985
%P 125-142
%V 79
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1985__79_143188/
%F IM_1985__79_143188