1. Faculty of Management and Economics, Tomas Bata University in Zlin, Zlin, Czech Republic
2. Faculty of Mining, Ecology, Process Control and Geotechnologies, Institute of Earth Resources, Technical University of Košice, Košice, Slovakia
3. Faculty of Economics and Business, Pan-European University in Bratislava, Bratislava, Slovak Republic
4. Faculty of Operation and Economics of Transport and Communications, Department of Economics, University of Žilina, Slovakia