@article{1102983302, author = {Gillman, David S.}, title = {Free curves in $E^{3}$.}, journal = {Pacific J. Math.}, volume = {31}, number = {3}, year = {1969}, pages = { 533-542}, language = {en}, url = {http://dml.mathdoc.fr/item/1102983302} }
Gillman, David S. Free curves in $E^{3}$.. Pacific J. Math., Tome 31 (1969) no. 3, pp. 533-542. http://gdmltest.u-ga.fr/item/1102983302/