@article{1077312238, author = {Earle, Clifford J.}, title = {The Teichm\"uller distance is differentiable}, journal = {Duke Math. J.}, volume = {44}, number = {1}, year = {1977}, pages = { 389-397}, language = {en}, url = {http://dml.mathdoc.fr/item/1077312238} }
Earle, Clifford J. The Teichmüller distance is differentiable. Duke Math. J., Tome 44 (1977) no. 1, pp. 389-397. http://gdmltest.u-ga.fr/item/1077312238/