1. Department of Economics, Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná 1, 010 26 Žilina, Slovak Republic
2. Department of Economics and Management, AMBIS University, Lindnerova 575/1, 180 00 Prague, Czech Republic
3. Faculty of Entrepreneurship and Law, Pan-European University, Spálená 76/14, 110 00 Prague, Czech Republic