Bol’shunov, A. V., G. V. Sokolova, and A. M. Avdeev. “Prospects for the Use of Traction Devices Friction Type for Drives of Mining, Transport and Technological Machines”. Journal of Mining Institute, Vol. 209, 1, p. 9, http://pmi.spmi.ru/index.php/pmi/article/view/5272.