Довбня, М.П., Л.М. Бондаренко, Д.В. Бобирь, and Р.О. Коренюк. 2016. “The Dependence of the Efficiency of Their Frictional Transmission Circuit”. Problems of Tribology 78 (4):115-23. https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/496.