Zhemerov, G. G., N. A. Ilyina, D. V. Tugay, and O. I. Kholod. “SUBWAY POWER SYSTEMS WITH MODERN SEMICONDUCTOR CONVERTERS AND ENERGY STORAGE DEVICES”. Electrical Engineering & Electromechanics, no. 1, Mar. 2013, pp. 41-49, doi:10.20998/2074-272X.2013.1.10.