@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/