1. V. I. Dmitriev and E. V. Zakharov, Integral Equations in Boundary Value Problems of Electrodynamics (Mosk. Gos. Univ., Moscow, 1987) [in Russian].
2. M. Costabel and E. Stephan, “A direct boundary integral equation method for transmission problems,” J. Math. Anal. Appl. 106, 367–413 (1985).
3. D. Colton and R. Kress, Integral Equation Methods in ScatteringTheory (Wiley, New York, 1984).
4. V. A. Tsetsokho, V. V. Voronin, and S. I. Smagin, “On the solution of diffraction problems using single-layer potentials,” Dokl. Akad. Nauk SSSR 302 (2), 323–327 (1988).
5. R. E. Kleinman and P. A. Martin, “On single integral equations for the transmission problem of acoustics,” SIAM J. Appl. Math. 48 (2), 307–325 (1988).