@article{GDZPPN002060299,
title = {Invertible Knot Cobordisms},
journal = {Commentarii mathematici Helvetici},
volume = {46},
year = {1971},
pages = {240-256},
zbl = {0227.57007},
url = {http://dml.mathdoc.fr/item/GDZPPN002060299}
}
Sumners, D.W. Invertible Knot Cobordisms. Commentarii mathematici Helvetici, Tome 46 (1971) pp. 240-256. http://gdmltest.u-ga.fr/item/GDZPPN002060299/