%0 Journal Article
%A P.J. Hilton
%T On excision and principal fibrations.
%J Commentarii mathematici Helvetici
%D 1961
%P 77-84
%V 35
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1961__35_139209/
%F CMH_1961__35_139209