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3. Viktorov, “Rayleigh And Lamb Waves” (New York, Plenum Press, 1967).
4. D.N. Alleyne and P. Cawley, NDT and E International, vol. 25, p. 11 (1992).
5. R.B. Thompson, G.A. Alers and M.A. Tennison, in IEEE Ultrasonics Symposium, Boston, p. 91 (1972).