1. Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Praha, Czech Republic
2. The Krkonoše Mountains National Park Administration, Vrchlabí, Czech Republic
3. Department of Geothermics, Institute of Geophysics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
4. Department of Geomorphology, Faculty of Earth Sciences and Environmental Management, University of Wrocław, Wrocław, Poland