@article{1200788199, author = {Kawamura, Tomomi}, title = {The unknotting numbers of $10\sb 139$ and $10\sb 152$ are 4}, journal = {Osaka J. Math.}, volume = {35}, number = {1}, year = {1998}, pages = { 539-546}, language = {en}, url = {http://dml.mathdoc.fr/item/1200788199} }
Kawamura, Tomomi. The unknotting numbers of $10\sb 139$ and $10\sb 152$ are 4. Osaka J. Math., Tome 35 (1998) no. 1, pp. 539-546. http://gdmltest.u-ga.fr/item/1200788199/