1. Abdrakhmanov, A.M.: 1990, ?On Integrable Rebounding Reflection Systems?, Vestn. Mosk. un-ta, Ser. 1, 5, 85?88 (in Russian).
2. Birkhoff, G.D.: 1927, Dynamical Systems, Amer. Math. Soc. Colloq. Publ., Vol. 9.
3. Jacobi, C.G.J.: 1884, Vorlesungen über Dynamik, Berlin.
4. Moser, J.: 1978, ?Various Aspects of Integrable Hamiltonian Systems?, Dynamical Systems, C.I.M.E. Lectures, Bressanone, Italy, Progress in Mathematics, Vol. 8, p. 273.
5. Wintner, A.: 1941, The Analytical Foundations of Celestial Mechanics, Princeton University Press.