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References
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G. Birkhoff, Dynamical Systems, New York, 1927; Dzh. Birkgof, Dinamicheskie sistemy, Moskva, 1942 |
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M. Morse, S. S. Cairns, Critical Points Theory in Global Analysis and Differential Topology, Academic Press, New York, 1969   |
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F. Takens, J. White, “Morse theory of double normals of immersions”, Indiana Univ. Math. J., 21:1 (1971), 11–17  |
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P. Pushkar, “Diameters of immersed manifolds and of wave fronts”, C. R. Acad. Sci. Paris, 326:2 (1998), 201–205  |
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M. Farber, S. Tabachnikov, “Topology of cyclic configuration spaces and periodic trajectories
of multi-dimensional billiards”, Topology, 41:3 (2002), 553–589 |
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M. Farber, S. Tabachnikov, “Periodic trajectories in 3-dimensional convex billiards”, Manuscripta Math., 108:4 (2002), 431–437 |
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F. S. Duzhin, “Lower bounds for the number of closed billiard trajectories of
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