@article{1178244919, author = {Busemann, Herbert}, title = {Similarities and differentiability}, journal = {Tohoku Math. J. (2)}, volume = {9}, number = {3}, year = {1957}, pages = { 56-67}, language = {en}, url = {http://dml.mathdoc.fr/item/1178244919} }
Busemann, Herbert. Similarities and differentiability. Tohoku Math. J. (2), Tome 9 (1957) no. 3, pp. 56-67. http://gdmltest.u-ga.fr/item/1178244919/