Довбня, Н., Л. Бондаренко, Д. Бобырь, and Я. І. Шевченко. “Analytical Determination of the Reduced Coefficient of Friction Ball and Roller Bearings”. Problems of Tribology, vol. 79, no. 1, June 2016, pp. 20-24, https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/505.