@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/