1. A. A. Maradudin, in Nonequilibrium Phonon Dynamics, Ed. by W. E. Bronn (Plenum, New York, 1985), p. 406.
2. A. E. H. Love, Some Problems of Geodynamics (Cambridge Univ. Press, London, 1911).
3. I. A. Viktorov, in Proceedings of X All-Union Conference on Quantum Electronics (Fan, Tashkent, 1978), p. 101.
4. J. L. Bleustein, Appl. Phys. Lett. 13, 412 (1968).
5. Yu. V. Gulyaev, Pis’ma Zh. Éksp. Teor. Fiz. 9, 37 (1969) [JETP Lett. 9, 21 (1969)].