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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 14, No. 6, pp. 1266–1284, November–December, 1973.
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Maergoiz, I.D. Limits on the gradient of a harmonic function at the boundary of a domain. Sib Math J 14, 890–903 (1973). https://doi.org/10.1007/BF00975895
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DOI: https://doi.org/10.1007/BF00975895