1. V. P. Shestopalov, The Method of the Riemann-Hilbert Problem in the Theory of the Diffraction and Propagation of Electromagnetic Waves [in Russian], Vishcha Shkola, Kharkov State Univ. (1971).
2. S. M. Belotserkovskii, Thin Load-Carrying Surfaces in Subsonic Gas Flow [in Russian], Nauka, Moscow (1965).
3. I. K. Lifanov, ?On singular integral equations with one-dimensional and multiple Cauchy type integrals,? Dokl. Akad. Nauk SSSR,239, No. 2, 265?268 (1978).
4. I. K. Lifanov and A. F. Matveev, ?On a singular integral equation on a system of segments,? Teor. Funktsii Funktsional. Anal. Prilozhen. (Kharkov), No. 40, 104?110 (1983).
5. Yu. V. Gandel', ?On dual Fourier series of certain mixed boundary value problems of mathematical physics,? Teor. Funktsii Funktsional. Anal. Prilozhen. (Kharkov), No. 38, 15?18 (1982).