1. Department of Process Management, Faculty of Management, Wroclaw University of Economics, 50-137 Wrocław, Poland
2. Department of Spatial and Environmental Economics, University of Economics in Katowice, 40-287 Katowice, Poland
3. Institute of Management and Quality Sciences, Faculty of Economic Sciences, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland