Marchenko, D.D., and K.S. Matvyeyeva. “Increasing Warning Resistance of Engine Valves by Gas Nitrogenization Method”. Problems of Tribology 27, no. 2/104 (June 24, 2022): 20–27. Accessed April 29, 2024. https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/853.