1. A. G. Gurevich and G. A. Melkov, Magnetization Oscillations and Waves (Nauka, Moscow, 1994; CRC-Press, Boca Raton, Fl., 1996).
2. P. E. Wigen, Nonlinear Phenomena and Chaos in Magnetic Materials (World Sci., Singapore, 1994).
3. A. K. Zvezdin and A. F. Popkov, Zh. Éksp. Teor. Fiz. 84, 606 (1983) [Sov. Phys. JETP 57, 350 (1983)].
4. B. A. Kalinikos, N. G. Kovshikov, and A. N. Slavin, Zh. Éksp. Teor. Fiz. 94, 159 (1988) [Sov. Phys. JETP 67, 303 (1988)].
5. M. Chen, M. A. Tsankov, J. M. Nash, and C. E. Patton, Phys. Rev. Lett. 70, 1707 (1993).