@article{1183486350,
author = {Levy, Harry},
title = {Normal congruences of curves in Riemann space},
journal = {Bull. Amer. Math. Soc.},
volume = {31},
number = {9-10},
year = {1925},
pages = { 39-42},
language = {en},
url = {http://dml.mathdoc.fr/item/1183486350}
}
Levy, Harry. Normal congruences of curves in Riemann space. Bull. Amer. Math. Soc., Tome 31 (1925) no. 9-10, pp. 39-42. http://gdmltest.u-ga.fr/item/1183486350/