Довбня, Н., Л. М. Бондаренко, and Д. Бобырь. “To Determination of Locking Effort of Clamping Devices of Shoe Tree Type”. Problems of Tribology, vol. 59, no. 1, July 2014, pp. 77-79, https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/357.