@article{1077491080,
author = {Kasner, Edward},
title = {Lineal element transformations of space for which normal congruences
of curves are converted into normal congruences},
journal = {Duke Math. J.},
volume = {5},
number = {1},
year = {1939},
pages = { 72-83},
language = {en},
url = {http://dml.mathdoc.fr/item/1077491080}
}
Kasner, Edward. Lineal element transformations of space for which normal congruences
of curves are converted into normal congruences. Duke Math. J., Tome 5 (1939) no. 1, pp. 72-83. http://gdmltest.u-ga.fr/item/1077491080/