@article{GDZPPN002313723, title = {The Fundamental Group of Fibered Knot Cobordisms.}, journal = {Mathematische Annalen}, volume = {229}, year = {1977}, pages = {243-252}, zbl = {0325.55001}, url = {http://dml.mathdoc.fr/item/GDZPPN002313723} }
Scharlemann, Martin. The Fundamental Group of Fibered Knot Cobordisms.. Mathematische Annalen, Tome 229 (1977) pp. 243-252. http://gdmltest.u-ga.fr/item/GDZPPN002313723/