@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/