Babyak, Mykola, Volodymyr Horobets, Viktor Sychenko, and Yevhen Horobets. 2018. “Comparative Tests of Contact Elements at Current Collectors in Order to Comprehensively Assess Their Operational Performance”. Eastern-European Journal of Enterprise Technologies 6 (12 (96):13-21. https://doi.org/10.15587/1729-4061.2018.151751.