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3. L. M. Brekhovskikh, Waves in Layered Media (Nauka, Moscow, 1973; Academic, New York, 1980).
4. R. Mittra and S. W. Lee, Analytical Techniques in the Theory of Guided Waves (Macmillan, New York, 1971; Mir, Moscow, 1974).
5. L. P. Yatsuk and I. V. Smirnova, Izv. Vyssh. Uchebn. Zaved., Radioelektron., 10, 359 (1967).