@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/