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2. J.-P. Monchalin and J. Wagner, in Nondestructive Testing Handbook, Ultrasonic Testing,vol. 7, 2nd ed., op. cit. see section 10 , part 1.
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4. R. J. Conant and K. L. Telschow, in Review of Progress in Quantitative Nondestructive Evaluation, vol. 8A, edited by D. O. Thompson and D. E. Chimenti (Plenum Press, New-York, 1989), p. 497.
5. J.-P. Monchalin, IEEE Trans. Sonics, Ultrasonics, Freq. Control, UFFC-33. 485 (1986).