1. Institute of Geology and Palaeontology, Faculty of Science, Charles University, Prague, Czech Republic
2. Department of Environment, Faculty of Environment, University of J. E. Purkyně in Ústí nad Labem, Ústí nad Labem, Czech Republic
3. Department of Preschool and Primary Education, Faculty of Education, University of J. E. Purkyně in Ústí nad Labem, Ústí nad Labem, Czech Republic