@article{GDZPPN002059479,
title = {Knot Cobordism Groups in Codimension Two.},
journal = {Commentarii mathematici Helvetici},
volume = {44},
year = {1969},
pages = {229-244},
zbl = {0176.22101},
url = {http://dml.mathdoc.fr/item/GDZPPN002059479}
}
Levine, J. Knot Cobordism Groups in Codimension Two.. Commentarii mathematici Helvetici, Tome 44 (1969) pp. 229-244. http://gdmltest.u-ga.fr/item/GDZPPN002059479/