1. M. A. Balter, Hardening of Machine Parts [in Russian], Mashinostroenie, Moscow (1978).
2. E. A. Kurits, "Investigation of the mechanism of hardening of steel in tempering after plastic surface deformation," Metalloved. Term. Obrab. Met., No. 12, 14?16 (1980).
3. A. G. Vasil'eva, Strain-Hardening of Hardened Structural Steels [in Russian], Mashinostroenie, Moscow (1981).