1. L. D. Landau and E. M. Lifshits, The Theory of Elasticity (Nauka, Moscow, 1965) [in Russian].
2. C. Kittel, Introduction to Solid State Physics, 8th ed. (Wiley, Hoboken, 2005).
3. K. L. Leont’ev, Akust. Zh. 47, 554 (1981).
4. V. N. Belomestnykh and E. P. Tesleva, Tech. Phys. 49, 1098 (2004).
5. V. N. Belomestnykh, Pis’ma Zh. Tekh. Fiz. 30 (3), 15 (2001).