@article{1183504870,
author = {Springer, C. E.},
title = {Dual geodesics on a surface},
journal = {Bull. Amer. Math. Soc.},
volume = {48},
number = {12},
year = {1942},
pages = { 901-906},
language = {en},
url = {http://dml.mathdoc.fr/item/1183504870}
}
Springer, C. E. Dual geodesics on a surface. Bull. Amer. Math. Soc., Tome 48 (1942) no. 12, pp. 901-906. http://gdmltest.u-ga.fr/item/1183504870/