Каплун, П.В., and В.А. Гончар. “Effect on Durability Ion Nitriding Open Gears.”. Problems of Tribology 76, no. 2 (June 28, 2015): 84-89. Accessed November 30, 2021. http://tribology.khnu.km.ua/index.php/ProbTrib/article/view/434.