Literature cited
A. M. Lyapunov, Papers on Potential Theory [in Russian], Gostekhizdat, Moscow-Leningrad (1949).
I. Stein, Singular Integrals and Differential Properties of Functions [Russian translation], Mir, Moscow (1973).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 31, No. 3, pp. 325–329, May–June, 1979.
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Saak, É.M. Analog of Neumann's theorem in class W2 (1)(ω) . Ukr Math J 31, 251–253 (1979). https://doi.org/10.1007/BF01089028
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DOI: https://doi.org/10.1007/BF01089028