1. V. A. Krasil’nikov and V. V. Krylov, Introduction to Physical Acoustics (Nauka, Moscow, 1984) [in Russian].
2. M. J. Ablowitz and H. Segur, Solitons and the Inverse Scattering Transform (SIAM, Philadelphia, Pa., 1981; Mir, Moscow, 1987).
3. A. V. Porubov, Amplification of Nonlinear Strain Waves in Solids (Word Sci., Singapore, 2003), p. 213.
4. A. M. Samsonov, G. V. Dreiden, A. V. Porubov, and I. V. Semenova, Phys. Rev. A 57(10), 5778 (1998).
5. A. M. Samsonov, G. V. Dreĭden, A. V. Porubov, and I. V. Semenova, Pisĭma Zh. Tekh. Fiz. 22(21), 61 (1996) [Tech. Phys. Lett. 22, 891 (1996)].