%0 Journal Article
%A Scherk, P.
%T On the Exactness of the Homotopy Sequence
%J Canadian mathematical bulletin
%D 1964
%P 617-618
%V 7
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-058-9/
%R 10.4153/CMB-1964-058-9
%F 10_4153_CMB_1964_058_9