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Anna Sowiżdżał
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Department of Fossil Fuel, Al. Mickiewicza 30, 30- 059 Kraków, Poland
Roman Semyrka
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Department of Fossil Fuel, Al. Mickiewicza 30, 30- 059 Kraków, Poland