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Translated from Matematicheskie Zametki, Vol. 55, No. 5, pp. 25–35, May, 1994.
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Vorobets, Y.B. On the measure of the set of periodic points of the billiard. Math Notes 55, 455–460 (1994). https://doi.org/10.1007/BF02110371
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DOI: https://doi.org/10.1007/BF02110371