%0 Journal Article
%A B. Steer
%A J.M. Boardman
%T On Hopf Invariants.
%J Commentarii mathematici Helvetici
%D 1967
%P 180-221
%V 42
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1967__42_139339/
%F CMH_1967__42_139339