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2. A. G. Gurevich and G. A. Melkov, Magnetic Oscillations and Waves [in Russian], Nauka, Moscow (1994), 464 pp.
3. S. Tikadzumi, The Physics of Ferromagnetism. Magnetic Characteristics and Applications (Mir, Moscow, 1987), 420 pp.
4. G. Zh. Rankis, Dynamics of Magnetization of Polycrystalline Ferrites [in Russian], Zinatne, Riga (1981), 186 pp.
5. L. Landau and E. Lifschitz, Phys. Z. Sowjetunion 8, 153 (1935) (in Collected Works of L. D. Landau [in Russian], edited by E. M. Lifshitz, Nauka, Moscow (1969), Vol. 1, p. 128).