@article{1183492346,
author = {Foster, M. C.},
title = {Congruences of lines of special orientation relative to a surface of reference},
journal = {Bull. Amer. Math. Soc.},
volume = {33},
number = {6},
year = {1927},
pages = { 750-759},
language = {en},
url = {http://dml.mathdoc.fr/item/1183492346}
}
Foster, M. C. Congruences of lines of special orientation relative to a surface of reference. Bull. Amer. Math. Soc., Tome 33 (1927) no. 6, pp. 750-759. http://gdmltest.u-ga.fr/item/1183492346/