@article{1183527798,
author = {Freilich, Gerald},
title = {Centers of curvature},
journal = {Bull. Amer. Math. Soc.},
volume = {72},
number = {4},
year = {1966},
pages = { 297-299},
language = {en},
url = {http://dml.mathdoc.fr/item/1183527798}
}
Freilich, Gerald. Centers of curvature. Bull. Amer. Math. Soc., Tome 72 (1966) no. 4, pp. 297-299. http://gdmltest.u-ga.fr/item/1183527798/