Geodesic
Unknotting Number, Genus, and Companion Tori.
Mathematische Annalen, Tome 280 (1988) no. 3, pp. 191-206.

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Mots-clés : sutured manifold, crossing changes, genus of a knot, unknotting number, companion tori, crossing link, crossing disk, incompressible torus, satellite knot, winding number 
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     author = {Martin Scharlemann and Abigail Thompson},
     title = {Unknotting {Number,} {Genus,} and {Companion} {Tori.}},
     journal = {Mathematische Annalen},
     pages = {191--206},
     publisher = {mathdoc},
     volume = {280},
     number = {3},
     year = {1988},
     zbl = {0616.57003},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__280_3_164360/}
}
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Martin Scharlemann; Abigail Thompson. Unknotting Number, Genus, and Companion Tori.. Mathematische Annalen, Tome 280 (1988) no. 3, pp. 191-206. http://geodesic.mathdoc.fr/item/MAN_1988__280_3_164360/