1. 1) A. A. Griffith: Phil. Trans. Roy. Soc. 221(1920) 163–198.
2. 2) A. A. Griffith: Proc. 1st Intern. Congr. Appl. Mech., (Delft, 1924) pp. 55–63.
3. 3) G. C. Sih and H. Liebowitz: Fracture, An Advance Treatise, vol. II(Mathematical Fundamentals), chap. 2, ed. by H. Liebowitz, (Academic Press, 1968).
4. 4) T. L. Anderson: Fracture Mechanics -Fundamental and Applications-, (CRC Press, Taylor & Francis, 2005).
5. 5) H. Okamura: Introduction to Linear Fracture Mechanics, (Baifukan Co., Ltd., 2006). (in Japanese)