1. Department of Quantitative Methods and Economic Informatics, Faculty of Operation and Economics of Transport and Communications, University of Zilina, 01026 Zilina, Slovakia
2. Department of Road and Urban Transport, Faculty of Operation and Economics of Transport and Communications, University of Zilina, 01026 Zilina, Slovakia
3. Department of Railway Transport, Faculty of Operation and Economics of Transport and Communications, University of Zilina, 01026 Zilina, Slovakia
4. Faculty of Social and Economic Studies, Jan Evangelista Purkyňe University in Ústí nad Labem, 40096 Ústí nad Labem, Czech Republic