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L’vov. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 39, No. 2, pp. 261–280, March–April, 1998.
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Borsuk, M.V. Dini continuity of the first-order derivatives of solutions to the dirichlet problem for linear second-order elliptic equations in a nonsmooth domain. Sib Math J 39, 226–244 (1998). https://doi.org/10.1007/BF02677508
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DOI: https://doi.org/10.1007/BF02677508