Unknotting number one knots are prime.
Scharlemann, M.G.
Inventiones mathematicae, Tome 82 (1985), p. 37-56 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1985-01-01
EUDML-ID : urn:eudml:doc:143276 
@article{GDZPPN002102099,
     title = {Unknotting number one knots are prime.},
     journal = {Inventiones mathematicae},
     volume = {82},
     year = {1985},
     pages = {37-56},
     zbl = {0576.57004},
     url = {http://dml.mathdoc.fr/item/GDZPPN002102099}
}

Scharlemann, M.G. Unknotting number one knots are prime.. Inventiones mathematicae, Tome 82 (1985) pp. 37-56. http://gdmltest.u-ga.fr/item/GDZPPN002102099/