1. N. A. Galaktionova, Vodorod v Metallakh (Moscow: Metallurgiya: 1967) (in Russian).
2. L. S. Moroz and B. B. Chechulin, Vodorodnaya Khrupkost' Metallov (Moscow: Metallurgiya: 1967) (in Russian).
3. C. Zapffe, Trans. ASM, 39: 191 (1947).
4. A. S. Tetleman, Fracture of Solids (New York: John Wiley and Sons: 1962).
5. A. R. Troiano, Trans. ASM, 52: 54 (1960).