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- [4] INTEGRABLE BILLIARDS VESTNIK MOSKOVSKOGO UNIVERSITETA SERIYA 1 MATEMATIKA MEKHANIKA, 1990, (06): : 28 - 33
- [5] ON BIRKHOFF BILLIARDS PERIODICAL SOLUTIONS VESTNIK MOSKOVSKOGO UNIVERSITETA SERIYA 1 MATEMATIKA MEKHANIKA, 1987, (05): : 72 - 75