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4. Gutnikov, V.A., Kiryakin, V.Yu., Lifanov, I.K., et al., Numerical Solution to a Two-Dimensional Hypersingular Integral Equation, and Sound Propagation in Urban Areas, Zh. Vychisl. Mat. Mat. Fiz., 2007, vol. 47, no. 12, pp. 2088–2100. Engl. transl. in Comput. Math. Math. Phys., 2007, vol. 47, no. 12, pp. 2002–2013.
5. Lebedeva, S.G. and Setukha, A.V., On the Numerical Solution of a Complete Two-Dimensional Hypersingular Integral Equation by the Method of Discrete Singularities, Differ. Uravn., 2013, vol. 49, no. 2, pp. 223–233. Engl. transl. in Differ. Equ., 2013. vol. 49. no. 2, pp. 224–234.