1. Yu.M. Lakhtin and Ya. D. Kogan, Nitriding of Steel [in Russian], Mashgiz, Moscow (1976), 256 p.
2. A. N. Minkevich, Thermochemical Treatment of Steel [in Russian], Mashgiz, Moscow (1961), 287 p.
3. N. S. Gorbunov and I. D. Yudin, Diffusion Metallic Coatings [in Russian], Izd. Akad. Nauk SSSR, Moscow (1986), 199 p.
4. Yu. M. Lakhtin, Diffusion Metallization [in Russian], Mashgiz, Moscow (1961), 107 p.
5. S. S. Shteinberg, Physical Metallurgy [in Russian], Mashinostroenie, Moscow (1955), Vol. 3, 324 p.