1. Department of Industrial Informatics, Silesian University of Technology, 44-100 Gliwice, Poland
2. Institute of Economics and Finance, University of Szczecin, 71-101 Szczecin, Poland
3. Faculty of Organization and Management, Silesian University of Technology, 44-100 Gliwice, Poland
4. KOMAG Institute of Mining Technology, Pszczynska 37, 44-101 Gliwice, Poland
5. Faculty of Public Governance and Business, Mykolas Romeris University, LT-08303 Vilnius, Lithuania
6. Penn State Hazleton, Pennsylvania State University, 76 University Drive, Hazleton, PA 18202, USA