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2. N. I. Muskhelishvili, Singular Integral Equations, 2nd ed. (Fizmatlit, Moscow, 1968).
3. F. V. Gakhov and Yu. I. Cherskii, Convolution-Type Equations (Nauka, Moscow, 1978).
4. N. V. Govorov, Riemann Boundary Value Problem with Infinite Index (Nauka, Moscow, 1986).
5. I. I. Danilyuk, Irregular Boundary Value Problems on Plane (Nauka, Moscow, 1975).