Geodesic
Existence of a continuum of closed invariant curves for a convex billiard
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 3 
V. F. Lazutkin. Existence of a continuum of closed invariant curves for a convex billiard. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 3. http://geodesic.mathdoc.fr/item/RM_1972_27_3_a13/
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     author = {V. F. Lazutkin},
     title = {Existence of a~continuum of closed invariant curves for a~convex billiard},
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     year = {1972},
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     url = {http://geodesic.mathdoc.fr/item/RM_1972_27_3_a13/}
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[1] Dzh. D. Birkgof, Dinamicheskie sistemy, Gostekhizdat, M.–L., 1941

[2] J. Moser, “On invariant curves of area-preserving mapping of an annulus”, Nachr. Akad. Wiss. Göttingen. Math-Phys. Kl., 11a (1962), 1–20 | MR