1. 1) C. Hellier: Handbook of Nondestructive Evaluation, (McGraw-hill, New York, 2003), 10.1–10.39.
2. 2) Y. Mizutani ed.: Practical Acoustic Emission Testing, (Springer Japan, Tokyo, 2016), pp. 5–12.
3. 3) T. Kishi, M. Ohtsu and S. Yuyama: Acoustic Emission beyond the Millennium, (Elsevier Science, Amsterdam, 2000) pp.1–18.
4. 4) N. Saito, M. Takemoto, H. Suzuki and K. Ono: Trans. of the J. Soc. for Comp. Mater. 26 (2000) 227–235 (In Japanese). 10.6089/jscm.26.227
5. 5) M.A. Hamstad, J. Gary and A. O'Gallagher: JAE 17 (1999) 37–47.