1. S. I. Yushchuk, Zh. Tekh. Fiz. 69(12), 62 (1999) [Tech. Phys. 44 (12), 1454 (1999)].
2. V. V. Shagaev, Fiz. Tverd. Tela (St. Petersburg) 40(11), 2089 (1998) [Phys. Solid State 40 (11), 1892 (1998)].
3. L. D. Landau and E. M. Lifshitz, Course of Theoretical Physics, Vol. 8: Electrodynamics of Continuous Media (Nauka, Moscow, 1982; Butterworth-Heinemann, Oxford, 1984).
4. A. G. Gurevich, Magnetic Resonance in Ferrites and Antiferromagnets (Nauka, Moscow, 1973) [in Russian].
5. M. A. Lavrent’ev and B. V. Shabat, Methods in the Theory of Functions of the Complex Variable (Nauka, Moscow, 1973) [in Russian].