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Translated from Matematicheskie Zametki, Vol. 47, No. 1, pp. 3–14, January, 1990.
The author thanks D. B. Anosov for useful remarks.
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Aranson, S.K. The problem of gray boxes. Mathematical Notes of the Academy of Sciences of the USSR 47, 3–10 (1990). https://doi.org/10.1007/BF01157277
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DOI: https://doi.org/10.1007/BF01157277