1. A.S. Birks, Nondestructive Testing Handbook 7, Ultrasonic Testing, ASNT, 1991.
2. S. Miyoshi, Ultrasonic Technology Handbook, Nikkan Kogyo Newspaper Co., 1996 (in Japanese).
3. A. Sutin, Nonlinear acoustic nondestructive testing of cracks, 14th ISNA, 1996, p. 328.
4. Linear and nonlinear ultrasonic properties of fatigued 410Cb stainless steel;Na;Rev. QNE,1996
5. R. Truell, C. Elbaum, B.B. Chick, Ultrasonic Methods in Solid State Physics, Academic Press, New York, 1969, p. 38.