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@article{IM_1992__108_2_144004, author = {N\'andor Sim\'anyi}, title = {The {K-property} of {N} billiard balls {I.}}, journal = {Inventiones mathematicae}, pages = {521--548}, publisher = {mathdoc}, volume = {108}, number = {2}, year = {1992}, zbl = {0759.58029}, url = {http://geodesic.mathdoc.fr/item/IM_1992__108_2_144004/} }
Nándor Simányi. The K-property of N billiard balls I.. Inventiones mathematicae, Tome 108 (1992) no. 2, pp. 521-548. http://geodesic.mathdoc.fr/item/IM_1992__108_2_144004/