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Translated from Matematicheskie Zametki, Vol. 33, No. 5, pp. 641–655, May, 1983.
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Konyagin, S.V. Sets of points of nonemptiness and continuity of the metric projection. Mathematical Notes of the Academy of Sciences of the USSR 33, 331–338 (1983). https://doi.org/10.1007/BF01158278
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DOI: https://doi.org/10.1007/BF01158278