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Levelling an unknotting tunnel

Hiroshi Goda, Martin Scharlemann and Abigail Thompson

Geometry & Topology 4 (2000) 243–275
Bibliography
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3 H Goda, M Ozawa, M Teragaito, On tangle decompositions of tunnel number one links, J. Knot Theory Ramifications 8 (1999) 299 MR1691429
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