@article{1102947522, author = {Childress, J. A.}, title = {Restricting isotopies of spheres.}, journal = {Pacific J. Math.}, volume = {49}, number = {2}, year = {1973}, pages = { 415-418}, language = {en}, url = {http://dml.mathdoc.fr/item/1102947522} }
Childress, J. A. Restricting isotopies of spheres.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 415-418. http://gdmltest.u-ga.fr/item/1102947522/