Altus, Juraj, Milan Novak, Alena Otcenasova, Michal Pokorny, and Adam Szelag. “Quality Parameters of Electricity Supplied to Electric Railways”. Communications - Scientific letters of the University of Zilina 3, no. 2-3 (September 30, 2001): 48-60. Accessed April 8, 2026. http://journals.uniza.sk/index.php/communications/article/view/1440.