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Ján Ondruš
University of Zilina in Zilina, Faculty of Operation and Economics of Transport and Communications, Department of Road and Urban Transport Univerzitná 8251/1, SK-010 26 Žilina, Slovak Republic
Peter Hockicko
University of Zilina in Zilina, Faculty of Electrical Engineering, Department of Physics Univerzitná 8251/1, SK-010 26 Žilina, Slovak Republic