Authors
Violetta Sokoła-Szewioła
violetta.sokola-szewiola@polsl.pl
Silesian University of Technology, Faculty of Mining and Geology ul. Akademicka 2A, 44-100, Gliwice, Poland
Monika Żogała
Silesian University of Technology, Faculty of Mining and Geology ul. Akademicka 2A, 44-100, Gliwice, Poland