Дрогомирецький, Я.М., and А.О. Криль. “Calculation of the Sealing Device Roller Cone Bit”. Problems of Tribology 74, no. 4 (June 18, 2015): 17–22. Accessed November 22, 2024. https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/402.