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Translated from Matematicheskie Zametki, Vol. 53, No. 1, pp. 68–82, January, 1993.
In Conclusion, the author is obliged to express his gratitude to Professor A. A. Novruzov for useful discussions and help in carrying out this work.
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Mamedov, F.I. Regularity of solutions of linear and quasilinear equations of elliptic type in divergence form. Math Notes 53, 50–58 (1993). https://doi.org/10.1007/BF01208522
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DOI: https://doi.org/10.1007/BF01208522