1. Ya. B. Fridman, The Mechanical Properties of Metals [in Russian], Vol. 1, Mashinostroenie, Moscow (1974), p. 169.
2. F. McClintock and A. Argon, The Deformation and Failure of Metals [Russian translation], Mir, Moscow (1970), p. 337.
3. A. P. Gulyaev, "The strength and toughness of metallic materials," Metalloved. Term. Obrab. Met., No. 10, 72?75 (1973).
4. A. P. Gulyaev, "Ductile and brittle fracture of steel," Metalloved. Term. Obrab. Met., No. 7, 63?64 (1977).
5. M. L. Bernshtein and V. A. Zaimovskii, The Structure and Mechanical Properties of Metals [in Russian], Metallurgiya, Moscow (1970).