Author(s):
1. Danijela Petrović, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Zdravko Popović, University of Belgrade-Faculty of Forestry, , Serbia
3. Vojislav Dukić, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Nebojša Todorović, University of Belgrade-Faculty of Forestry, , Serbia