Authors
Zygmunt Kowalski
Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Kraków, Poland
Agnieszka Makara
Faculty of Chemical Engineering and Technology, Cracow University of Technology, Kraków, Poland
Anna Henclik
Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Kraków, Poland
Joanna Kulczycka
AGH University of Science and Technology, Faculty of Management, Kraków, Poland
Marcin Cholewa
Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Kraków, Poland