1. Faculty of Materials Engineering, Silesian University of Technology, Krasinskiego 8, 40-019 Katowice, Poland
2. Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, al. Armii Krajowej 19, 42-201 Czestochowa, Poland
3. Cognor SA Ferrostal Łabędy Gliwice, Anny Jagiellonki Street 47, 44-109 Gliwice, Poland