1. L. Brillouin and M. Parodi, Wave Propagation in Periodic Structures (Dover, New York, 1946; Inostrannaya Literatura, Moscow, 1959).
2. L. M. Brekhovskikh, Acoustics of Layered Media (Nauka, Moscow, 1973; Springer, Berlin, 1990).
3. F. G. Bass, A. A. Bulgakov, and A. P. Tetervov, High-Frequency Properties of Semiconductors with Superlattices (Nauka, Moscow, 1989) [in Russian].
4. V. F. Shabanov, S. Ya. Vetrov, and A. V. Shabanov, Optics of Real Photonic Crystals: Liquid Crystal Defects and Inhomogeneities (Siberian Branch of the Russian Academy of Sciences, Novosibirsk, 2005) [in Russian].
5. C. Elachi, Proc. IEEE 64(12), 1666 (1976).