Geodesic
The Liouville foliation of the billiard book modelling the Goryachev--Chaplygin case
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2020), pp. 64-68

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The Fomenko–Zieshang invariant of an interesting case of an integrable billiard book is calculated and it is shown that such a book models the dynamics of Goryachev–Chaplygin integrable case on a certain isoenergy surface. 
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     author = {V. V. Vedyushkina},
     title = {The {Liouville} foliation of the billiard book modelling the {Goryachev--Chaplygin} case},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {64--68},
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V. V. Vedyushkina. The Liouville foliation of the billiard book modelling the Goryachev--Chaplygin case. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2020), pp. 64-68. http://geodesic.mathdoc.fr/item/VMUMM_2020_1_a9/