@article{GDZPPN002306875, title = {The Poincar\'e Series of a Coxeter Group.}, journal = {Mathematische Annalen}, volume = {196}, year = {1972}, pages = {161-174}, zbl = {0286.20062}, url = {http://dml.mathdoc.fr/item/GDZPPN002306875} }
Macdonald, I.G. The Poincaré Series of a Coxeter Group.. Mathematische Annalen, Tome 196 (1972) pp. 161-174. http://gdmltest.u-ga.fr/item/GDZPPN002306875/