1. 1 Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná 8215/1, 010 26 Žilina; Slovakia +421/41 513 3507
2. 2 Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná 8215/1, 010 26 Žilina; Slovakia +421/41 513 3412
3. 3 Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná 8215/1, 010 26 Žilina; Slovakia +421/41 513 3257
4. 4 Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná 8215/1, 010 26 Žilina; Slovakia +421/41 513 3278
5. 5 Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná 8215/1, 010 26 Žilina; Slovakia +421/41 513 3510