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@article{MAN_1977__225_162935, author = {Martin Scharlemann}, title = {The {Fundamental} {Group} of {Fibered} {Knot} {Cobordisms.}}, journal = {Mathematische Annalen}, pages = {243--252}, publisher = {mathdoc}, volume = {225}, year = {1977}, zbl = {0325.55001}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__225_162935/} }
Martin Scharlemann. The Fundamental Group of Fibered Knot Cobordisms.. Mathematische Annalen, Tome 225 (1977), pp. 243-252. http://geodesic.mathdoc.fr/item/MAN_1977__225_162935/