Geodesic
On the measure of the set of periodic points of the billiard
Matematičeskie zametki, Tome 55 (1994) no. 5, pp. 25-35 
Ya. B. Vorobets. On the measure of the set of periodic points of the billiard. Matematičeskie zametki, Tome 55 (1994) no. 5, pp. 25-35. http://geodesic.mathdoc.fr/item/MZM_1994_55_5_a2/
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     title = {On the measure of the set of periodic points of the billiard},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Rychlik M. R., “Periodic points of the billiard ball map in a convex domain”, J. Differential Geometry, 30:1 (1989), 191–205 | MR | Zbl

[2] Stojanov L., “Note on the periodic points of the billiard”, J. Differential Geometry, 34:3 (1991), 835–837 | MR | Zbl

[3] Shilov G. E., Gurevich B. L., Integral, mera i proizvodnaya, Nauka, M., 1967

[4] Kornfeld I. P., Sinai Ya. G., Fomin S. V., Ergodicheskaya teoriya, Nauka, M., 1980