1. Faculty of Economics, Czech Republic, Department of Trade and Tourism, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic;
2. Faculty of Economics, Czech Republic, Department of Management, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic;
3. Faculty of Economics, Czech Republic, Department of Economics and Quantitative methods, University of West Bohemia in Pilsen, Plzeň, Czech Republic