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 Cet article a éte moissonné depuis la source Math-Net.Ru

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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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     title = {Orbital invariants of flat billiards bounded by arcs of confocal quadrics and containing focuses},
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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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