@article{GDZPPN00210976X,
title = {The K-property of N billiard balls I.},
journal = {Inventiones mathematicae},
volume = {110},
year = {1992},
pages = {521-548},
zbl = {0759.58029},
url = {http://dml.mathdoc.fr/item/GDZPPN00210976X}
}
Simányi, Nándor. The K-property of N billiard balls I.. Inventiones mathematicae, Tome 110 (1992) pp. 521-548. http://gdmltest.u-ga.fr/item/GDZPPN00210976X/