Afanasov, A. M., A. Y. Drubetskiy, S. V. Arpul, and A. P. Khvorostyankina. “Energy Efficiency Determination of Loading-Back System of Electric Traction Machines”. Science and Transport Progress, no. 2(50), Apr. 2014, pp. 67-73, doi:10.15802/stp2014/23747.