%0 Journal Article
%A S.P. Plotnick
%A A. I. Suciu
%T k-Invariants of knotted 2-spheres.
%J Commentarii mathematici Helvetici
%D 1985
%P 54-84
%V 60
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1985__60_140000/
%F CMH_1985__60_140000