1. J. R. Low, Jr.:Fracture of Engineering Materials, ASM, p. 127, 1964.
2. R. Viswanathan:Met. Trans., 1971, vol. 2, p. 809.
3. B. J. Schulz and C. J. McMahon:ASTM STP 479, 1972, p. 104.
4. R. D. McRight and R. W. Staehle: Int. Conf. on Stress Corrosion Cracking and Hydrogen Embrittlement of Iron Base Alloys, Firminy, France, June, 1973.
5. Work of R. Smialowski as reported by A. R. Elsea and E. E. Fletcher: DMIC Report 219, Battelle Memorial Inst., June, 1965.