Пастух, И., Г. Соколова, and Н. Лукьянюк. “ Nitridin With Glow Discharge: State and Prospects”. Problems of Tribology, vol. 69, no. 3, July 2014, pp. 18-22, https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/150.