1. Institute of Safety and Quality Engineering, Faculty of Engineering Management, Poznan University of Technology, 60-965 Poznan, Poland
2. Faculty of Materials Science and Engineering in Katowice, Silesian University of Technology in Gliwice, 40-019 Katowice, Poland
3. Faculty of Economics and Management, University of Zielona Gora, 65-417 Zielona Gora, Poland