1. Department of Forest Ecology, Faculty of Forestry and Wood Sciences Czech University of Life Sciences Praha Czech Republic
2. Academy of Sciences of the Czech Republic, Department of Statistical Modeling Institute of Computer Science Prague 8 Czech Republic
3. Prales Rosina Slovakia
4. Department of Forestry and Renewable Forest Resources, Biotechnical Faculty University of Ljubljana Ljubljana Slovenia
5. Department of Forest Science Biliran Province State University Biliran Philippines