1. F. G. Mass and I. M. Fuks, Wave Scattering by a Statistically Uneven Surface [in Russian], Nauka, Moscow (1972).
2. D. Colton and R. Kress, Integral-Equation Methods in Scattering Theory [Russian translation], Mir, Moscow (1987).
3. K. Furutsu, J. Opt. Soc. Am. A,2, No. 12, 2244 (1985).
4. K. Furutsu, J. Opt. Soc. Am. A,2, No. 12, 2260 (1985).
5. A. G. Sveshnikov, Zh. Vychisl. Mat. Fiz.,3, No. 2, 314 (1963).