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2. L. M. Brekhovskikh and O. A. Godin, Acoustics of Layered Media, Vol. 1: Fundamentals of Reflection and Propagation of Sound (Nauka, Moscow, 1989) [in Russian].
3. V. V. Gavrilin, Yu. I. Grigulis, and V. M. Porin’sh, Electromagnetic Radiowave Device for Control of Layers of Semiconductor and Metallic Structures (Zinatie, Riga, 1982) [in Russian].
4. E. Kamke, Gewöhnliche Differentialgleichungen (Academie, Leipzig, 1959; Nauka, Moscow, 1976).
5. A. G. Gantimurov and Yu. B. Bashkuev, J. Commun. Techn. Electron. 53, 792 (2008).