SERHIY BURIAKOVSKYI; BORYS LIUBARSKYI; ARTEM MASLII; DANYLO POMAZAN; TATYANA TAVRINA. Research of a Hybrid Diesel Locomotive Power Plant Based on a Free-Piston Engine. Communications - Scientific letters of the University of Zilina, v. 22, n. 3, p. 103-109, 8 Jul. 2020.