1. E. P. Papadakis, IEEE Trans. Sonics Ultrason. 11, 19 (1964).
2. A. V. Clark and R. B. Mignogna, Ultrasonics 21, 57 (1983).
3. R. B. Mignogna, A. V. Clark, B. B. Rath, and C. L. Vold, in Nondestructive Methods for Material Property Determination, C. Olaf and R. E. Green, Jr., Eds. (Plenum Press, New York, 1984), p. 339.
4. Y. Iwashimizu and K. Kubomura, Int. J. Solids Struct. 9, 99 (1973)
5. R. Truell, C. Elbaum and B. B. Chick, “Ultrasonic Methods in Solid State Physics,” (Academic Press, New York and London, 1969).