Mukhammadjonovich, B. J., and P. M. M. kizi. “Influence of Low Temperature Nitrocarburizing Modes on the Structure and Properties of Х12ф1 Steel”. Central Asian Journal of Theoretical and Applied Science, Vol. 4, no. 9, Sept. 2023, pp. 134-8, https://cajotas.centralasianstudies.org/index.php/CAJOTAS/article/view/1289.