Geodesic
A billiard realization of non-Bott singularities of integrable Hamiltonian systems with no more than one singular fiber of Seifert bundle
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2025), pp. 3-10

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The paper implements degenerate bifurcations of Liouville tori of systems with two degrees of freedom at a fixed energy and provided that there is no more than one special layer of type ($p$, $q$) in the corresponding Seifert fiber space. 
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     author = {A. A. Kuznetsova},
     title = {A billiard realization of {non-Bott} singularities of integrable {Hamiltonian} systems with no more than one singular fiber of {Seifert} bundle},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--10},
     publisher = {mathdoc},
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     year = {2025},
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A. A. Kuznetsova. A billiard realization of non-Bott singularities of integrable Hamiltonian systems with no more than one singular fiber of Seifert bundle. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2025), pp. 3-10. http://geodesic.mathdoc.fr/item/VMUMM_2025_2_a0/