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Translated from Matematicheskie Zametki, Vol. 47, No. 2, pp. 137–148, February, 1990.
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Tsar'kov, I.G. Continuity of the metric projection, structural and approximate properties of sets. Mathematical Notes of the Academy of Sciences of the USSR 47, 218–227 (1990). https://doi.org/10.1007/BF01156834
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DOI: https://doi.org/10.1007/BF01156834