On multivalent solutions of the Riemann–Hilbert problem in multiply connected domains by A. S. Efimushkin

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On the Neumann and Poincare problems for A-harmonic functions by A. S. Efimushkin

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On the Riemann–Hilbert problem for analytic functions in circular domains by A. S. Efimushkin, V. I. Rjazanov

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On the Riemann-Hilbert problem for the Beltrami equations in quasidisks by A. S. Efimushkin, V. I. Rjazanov

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On the regular solutions of the Riemann–Hilbert problem for the Betrami equations by A. S. Efimushkin, V. I. Rjazanov

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