1. W. Grafen and B. Edenhofer, “Acetylene low-pressure carburizing — a novel and superior carburizing technology,” Heat Treat. Met., 26(4), 79 – 85 (1999).
2. F. J. Otto and D. H. Herring, “Vacuum carburizing of aerospace and automotive materials,” Heat Treat. Progr., 5(1), 33 – 37 (2005).
3. P. Kula, J. Olejnik, and J. Kowalewski, “New vacuum carburizing technology,” Heat Treat. Progr., 1(1), 57 – 65 (2001).
4. N. M. Ryzhov, A. E. Smirnov, and R. S. Fakhurtdinov, “Control of carbon saturation of diffusion layer in vacuum carburizing of heat-resistant steels,” Metal Sci. Heat Treat., 46(7 – 8), 340 – 344 (2004).
5. M. Yu. Semenov, I. N. Gavrilin, and M. Yu. Ryzhova, “Computation-based analysis of the methods of hardening of gears from heat-resistant steels,” Metal Sci. Heat Treat., 56(1 – 2), 45 – 49 (2014).