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2. B. G. Gabdulkhaev, Direct Methods for Solving Singular Integral Equations of the First Kind (Kazan. Gos. Univ., Kazan, 1994) [in Russian].
3. A. N. Tikhonov and V. Ya. Arsenin, Solutions of Ill-Posed Problems (Nauka, Moscow, 1979; Halsted Press, New York, 1977).
4. N. K. Bari, Trigonometric Series (Fizmatlit, Moscow, 1961) [in Russian].
5. V. V. Ivanov, Theory of Approximate Methods and Its Application to the Numerical Solution of Singular Integral Equations (Naukova Dumka, Kiev, 1968) [in Russian].