@article{1102994419, author = {De Sapio, Rodolfo}, title = {Unknotting spheres via Smale.}, journal = {Pacific J. Math.}, volume = {19}, number = {3}, year = {1966}, pages = { 179-183}, language = {en}, url = {http://dml.mathdoc.fr/item/1102994419} }
De Sapio, Rodolfo. Unknotting spheres via Smale.. Pacific J. Math., Tome 19 (1966) no. 3, pp. 179-183. http://gdmltest.u-ga.fr/item/1102994419/