Plakhtii, O., Nerubatskyi, V., Sushko, D., Ryshchenko, I., Tsybulnyk, V. and Hordiienko, D. 2019. Improving energy characteristics of ac electric rolling stock by using the three-level active four-quadrant rectifiers. Eastern-European Journal of Enterprise Technologies. 4, 8 (100) (Jul. 2019), 6–14. DOI:https://doi.org/10.15587/1729-4061.2019.174112.