1. T. Yokobori, K. Sato and Y. Yamaguchi, Rep. Res. Inst. Str. Fract. Mat., Tohoku Univ., Sendai, Japan, 6 (1970) 49–67.
2. T. Yokobori and K. Sato, Rep. Res. Inst. Str. Fract. Mat., Tohoku Univ., Sendai, Japan, 8 (1972) 43–53.
3. T. Yokobori, K. Sato and H. Yaguchi, Rep. Res. Inst. Str. Fract. Mat., Tohoku Univ., Sendai, Japan, 9 (1973) 1–10.
4. D.L. Davidson and J. Lankford, Transactions ASME Journal Engineering Materials and Technology, 98 (1975) 24–29.
5. J. Lankford and D.L. Davidson, Transactions ASME Journal Engineering Materials and Technology, 98 (1975) 17–23.