Author(s):
1. Branko Glavonjić, University of Belgrade-Faculty of Forestry, , Serbia
2. Dragan Čomić, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Aleksandra Lazarević, University of Belgrade-Faculty of Forestry, , Serbia
4. Miljan Kalem , University of Belgrade-Faculty of Forestry, , Serbia