Authors
Jarosław Brodny
prof. Pol. Śl. Silesian University of Technology, Faculty of Organisation and Management Institute of Production Engineering ul. Roosevelta 26-28, 41-800, Zabrze, Poland
Magdalena Tutak
Silesian University of Technology, Faculty of Mining and Geology Institute of Mining ul. Akademicka 2, 44-100, Gliwice, Poland