@article{1183419752,
author = {Young, J. W.},
title = {A fundamental invariant of the discontinuous $\zeta$--groups
defined by the normal curves of order $n$ in a space of $n$ dimensions},
journal = {Bull. Amer. Math. Soc.},
volume = {15},
number = {3},
year = {1908},
pages = { 363-367},
language = {en},
url = {http://dml.mathdoc.fr/item/1183419752}
}
Young, J. W. A fundamental invariant of the discontinuous $\zeta$–groups
defined by the normal curves of order $n$ in a space of $n$ dimensions. Bull. Amer. Math. Soc., Tome 15 (1908) no. 3, pp. 363-367. http://gdmltest.u-ga.fr/item/1183419752/