TY  - JOUR
AU  - Wells, Robert
TI  - Double Covers and Metastable Immersions of Spheres
JO  - Canadian journal of mathematics
PY  - 1974
SP  - 145
EP  - 176
VL  - 26
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-016-1/
DO  - 10.4153/CJM-1974-016-1
ID  - 10_4153_CJM_1974_016_1
ER  -