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Translated from Matematicheskie Zametki, Vol. 37, No. 2, pp. 220–236, February, 1985.
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Yudin, A.A., Yudin, V.A. Polygonal Dirichlet Kernels and growth of Lebesgue constants. Mathematical Notes of the Academy of Sciences of the USSR 37, 124–135 (1985). https://doi.org/10.1007/BF01156757
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DOI: https://doi.org/10.1007/BF01156757