Geodesic
On the problem of the periodic trajectories of the Birkhoff billiard
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (1987), pp. 72-75 
D. V. Treschev. On the problem of the periodic trajectories of the Birkhoff billiard. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (1987), pp. 72-75. http://geodesic.mathdoc.fr/item/VMUMM_1987_5_a15/
@article{VMUMM_1987_5_a15,
     author = {D. V. Treschev},
     title = {On the problem of the periodic trajectories of the {Birkhoff} billiard},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {72--75},
     year = {1987},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_5_a15/}
}
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