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Grzegorz Poręba
Department of Radioisotopes (GADAM Centre of Excellence), Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland
Paweł Prokop
Department of Geomorphology and Hydrology, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Jana 22, 31-018, Krakow, Poland