@article{1102946599, author = {Cutler, William H.}, title = {On extending isotopies.}, journal = {Pacific J. Math.}, volume = {49}, number = {2}, year = {1973}, pages = { 31-35}, language = {en}, url = {http://dml.mathdoc.fr/item/1102946599} }
Cutler, William H. On extending isotopies.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 31-35. http://gdmltest.u-ga.fr/item/1102946599/