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@article{CMH_1986__61_140044, author = {Jonathan A. Hillman}, title = {Abelian normal subgroups of two-knot groups.}, journal = {Commentarii mathematici Helvetici}, pages = {122--148}, publisher = {mathdoc}, volume = {61}, year = {1986}, zbl = {0611.57015}, url = {http://geodesic.mathdoc.fr/item/CMH_1986__61_140044/} }
Jonathan A. Hillman. Abelian normal subgroups of two-knot groups.. Commentarii mathematici Helvetici, Tome 61 (1986), pp. 122-148. http://geodesic.mathdoc.fr/item/CMH_1986__61_140044/