@article{01278974, title = {Hard ball systems are completely hyperbolic.}, journal = {Annals of Mathematics. Second Series}, volume = {150}, year = {1999}, pages = {35-96}, doi = {10.2307/121019}, zbl = {0918.58040}, language = {en}, url = {http://dml.mathdoc.fr/item/01278974} }
Simányi, Nándor; Szász, Domokos. Hard ball systems are completely hyperbolic.. Annals of Mathematics. Second Series, Tome 150 (1999) pp. 35-96. doi : 10.2307/121019. http://gdmltest.u-ga.fr/item/01278974/