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Translated from Matematicheskie Zametki, Vol. 41, No. 3, pp. 356–364, March, 1987.
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Dezin, A.A. Nonstandard problems. Mathematical Notes of the Academy of Sciences of the USSR 41, 205–210 (1987). https://doi.org/10.1007/BF01158250
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DOI: https://doi.org/10.1007/BF01158250