Authors
Jozef Gnap
University of Žilina, Faculty of Operation and Economics of Transport and Communications, Žilina, Slovakia
Marek Dočkalik
University of Žilina, Faculty of Operation and Economics of Transport and Communications, Žilina, Slovakia
Grzegorz Dydkowski
grzegorz.dydkowski@ue.katowice.pl
University of Economics in Katowice, Department of Transport, Katowice, Poland