Gałaś A.,
Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Krakow, Poland
Kot-Niewiadomska A.,
Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Krakow, Poland
Simić V.,
University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia
Tost M.,
Montanuniversität Leoben, Mining Engineering and Mineral Economics, Leoben, Austria
Wårell L.,
Luleå University of Technology, Economics Unit, Luleå, Sweden
Gałaś S.,
AGH University of Krakow, Faculty of Geology, Geophysics and Environmental Protection, Krakow, Poland
