@article{1077379303, author = {Calabi, Eugenio and Hartman, Philip}, title = {On the smoothness of isometries}, journal = {Duke Math. J.}, volume = {37}, number = {1}, year = {1970}, pages = { 741-750}, language = {en}, url = {http://dml.mathdoc.fr/item/1077379303} }
Calabi, Eugenio; Hartman, Philip. On the smoothness of isometries. Duke Math. J., Tome 37 (1970) no. 1, pp. 741-750. http://gdmltest.u-ga.fr/item/1077379303/