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Translated from Matematicheskie Zametki, Vol. 2, No. 2, pp. 191–200, August, 1967.
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Vlasov, L.P. Chebyshev sets and approximately convex sets. Mathematical Notes of the Academy of Sciences of the USSR 2, 600–605 (1967). https://doi.org/10.1007/BF01094253
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DOI: https://doi.org/10.1007/BF01094253