TY  - JOUR
AU  - J. Levine
TI  - Knot Cobordism Groups in Codimension Two.
JO  - Commentarii mathematici Helvetici
PY  - 1969
SP  - 229
EP  - 244
VL  - 44
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1969__44_139394/
ID  - CMH_1969__44_139394
ER  -