@article{1183494071, author = {Benton, T. C.}, title = {A definition of an unknotted simple closed curve}, journal = {Bull. Amer. Math. Soc.}, volume = {36}, number = {11}, year = {1930}, pages = { 406-408}, language = {en}, url = {http://dml.mathdoc.fr/item/1183494071} }
Benton, T. C. A definition of an unknotted simple closed curve. Bull. Amer. Math. Soc., Tome 36 (1930) no. 11, pp. 406-408. http://gdmltest.u-ga.fr/item/1183494071/