%0 Journal Article
%A Wells, Robert
%T Double Covers and Metastable Immersions of Spheres
%J Canadian journal of mathematics
%D 1974
%P 145-176
%V 26
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-016-1/
%R 10.4153/CJM-1974-016-1
%F 10_4153_CJM_1974_016_1