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Translated from Matematicheskie Zametki, Vol. 57, No. 1, pp. 20–29, January, 1995.
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Balaganskii, V.S. On approximation properties of sets with convex complement. Math Notes 57, 15–20 (1995). https://doi.org/10.1007/BF02309389
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DOI: https://doi.org/10.1007/BF02309389