1. Yu. M. Lakhtin and Ya. D. Kogan, Structure and Strength of Nitrided Alloys (Metallurgiya, Moscow, 1982).
2. Yu. M. Lakhtin and Ya. D. Kogan, Nitriding of Steel (Mashinostroenie, Moscow, 1976).
3. Yu. M. Lakhtin, Ya. D. Kogan, G. Shpis, and Z. Bemer, Theory and Technology of Nitriding (Metallurgiya, Moscow, 1991).
4. O. A. Bannykh, V. M. Blinov, and M. V. Kostina, “Structure and properties of low-alloy high-nitrogen martensitic steels,” Metalloved. Term. Obrab. Met., No. 2, 3–8 (2003).
5. Yasuyuki Katada, “Current research activities on high nitrogen steels in Japan,” Materials Science Forum, 539–543 (2007).