Geodesic
Orbital invariants of flat billiards bounded by arcs of confocal quadrics and containing focuses
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2021), pp. 48-51 
V. V. Vedyushkina. Orbital invariants of flat billiards bounded by arcs of confocal quadrics and containing focuses. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2021), pp. 48-51. http://geodesic.mathdoc.fr/item/VMUMM_2021_4_a8/
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     author = {V. V. Vedyushkina},
     title = {Orbital invariants of flat billiards bounded by arcs of confocal quadrics and containing focuses},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {48--51},
     year = {2021},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2021_4_a8/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Rotation functions for flat billiards bounded by arcs of confocal quadrics and containing focuses are calculated. The orbital Bolsinov–Fomenko invariants of these dynamical systems are also calculated.

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