1. Silesian University of Technology, Faculty of Mechanical Engineering, ul. Konarskiego 18a, 44-100 Gliwice, Poland
2. Silesian University of Technology, Faculty of Materials Engineering and Metallurgy, ul. Krasińskiego 8, Katowice, Poland
3. University of West Bohemia, Faculty of Mechanical Engineering, Univerzitni 22 St., 30614 Plzen, Czech Republic