1. Thompson, D.O. and Chimenti, D.E.: Review of progress in quantitative nondestructive evaluation, Plenum Press, Vol.1 (1981) Vol. 10 (1991).
2. Miki, C., Fukazawa, M., Katoh, M. and Ohune, H.: Feasibility study on crack detection of fillet welded joint, Proc. of JSCE, No. 386, pp 329–337, 1987. (in Japanese)
3. Iijima, T., Hukami, M., Miki, C. and Tajima, J.: Study on fatigue crack detection in stiffening truss chord members, Proc. of JSCE, No.410, 1-12, pp 445–454, 1989. (in Japanese)
4. Krautkrmer, J. and Krautkrmer, H.: Ultrasonic Testing of Materials, Springer-Verlag, 1977.
5. Hull, B. and John, V.: Non-Destructive Testing, Macmillan Education, 1988.