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Translated from Ukrainskil Matematicheskli Zhurnal, Vol.20, No.5, pp.603–619, September–October, 1968.
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Dzyadyk, V.K. On a constructive characteristic of functions of Hölder classes on closed sets with a piece-wise smooth boundary admitting zero angles. Ukr Math J 20, 523–535 (1968). https://doi.org/10.1007/BF01091996
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DOI: https://doi.org/10.1007/BF01091996