@article{1183486147,
author = {Veblen, Oswald},
title = {Invariance of the Poincar\'e numbers of a discrete group},
journal = {Bull. Amer. Math. Soc.},
volume = {30},
number = {9-10},
year = {1924},
pages = { 405-406},
language = {en},
url = {http://dml.mathdoc.fr/item/1183486147}
}
Veblen, Oswald. Invariance of the Poincaré numbers of a discrete group. Bull. Amer. Math. Soc., Tome 30 (1924) no. 9-10, pp. 405-406. http://gdmltest.u-ga.fr/item/1183486147/