Authors
Marek Kalita
KOMAG Institute of Mining Technology, Gliwice, Poland
Domink Bałaga
KOMAG Institute of Mining Technology, Gliwice, Poland
Krzysztof Kaczmarczyk
KOMAG Institute of Mining Technology, Gliwice, Poland
Jonak Józef
Lublin University of Technology, Faculty of Mechanical Engineering, Lublin, Poland