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Translated from Matematicheskie Zametki, Vol. 37, No. 2, pp. 274–283, February, 1985.
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Kanovei, V.G. Problem of the existence of nonBorel AF∥-sets. Mathematical Notes of the Academy of Sciences of the USSR 37, 156–161 (1985). https://doi.org/10.1007/BF01156763
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DOI: https://doi.org/10.1007/BF01156763