1. Research Station in Szymbark, Institute of Geography and Spatial Organization; Polish Academy of Sciences; Szymbark 430 Szymbark 38-311 Poland
2. Department of Geoenvironmental Research, Institute of Geography and Spatial Organization; Polish Academy of Sciences; Św. Jana 22 Kraków 31-018 Poland
3. Department of Geomorphology; Maria Curie-Skłodowska University; al. Krasnicka 2cd/209 Lublin 20-718 Poland