1. Institute of Applied Economics, Faculty of Economics and Business, University of Debrecen, H-4032 Debrecen, Hungary
2. ELKH-DE High-Tech Technologies for Sustainable Management Research Group, University of Debrecen, Boszormenyi Street 138, H-4032 Debrecen, Hungary
3. Renewable Energy Research Group, Soós Ernő Research and Development Center, Circular Economy University Center Nagykanizsa, University of Pannonia, H-8800 Nagykanizsa, Hungary
4. Department of Statistics and Methodology, Faculty of Economics and Business, University of Debrecen, H-4032 Debrecen, Hungary