Authors
Ryszard Mielimąka
Silesian University of Technology, Faculty of Mining and Geology ul. Akademicka 2, 44-100, Gliwice, Poland
Justyna Orwat
Silesian University of Technology, Faculty of Mining and Geology ul. Akademicka 2, 44-100, Gliwice, Poland
Ewa Maciejowska-Figiel
Ewa.Maciejowska-Figiel@polsl.pl
Silesian University of Technology, Faculty of Mining and Geology ul. Akademicka 2, 44-100, Gliwice, Poland