1. Lord Rayleigh, Proc. Lond. Math. Soc. 17, 4 (1887).
2. B. A. Auld, Acoustic Fields and Waves in Solids, vol. II (John Wiley and Sons, New York, 1973), p. 95.
3. J. D. Maines and E. G. S. Paige, Proc. IEEE, 64, 639 (1976); A. A. Oliner, in Acoustic Surface Waves, ed. A. A. Oliner (Springer-Verlag, New York, 1978) p. 1.
4. F. A. Firestone and J. R. Frederick, J. Acoust. Soc. Am. 18, 200 (1946); see also, the discussion in I. A. Viktorov, Rayleigh and Lamb Waves (Plenum, New York, 1967), Chap. III.
5. See, for example, L. D. Landau and E. M. Lifshitz, Theory of Elasticity (Pergamon Press, New York, 1970).