Author(s):
1. Jelena Subotić, Republic of Srpska, Bosnia and Herzegovina
2. Vojislav Dukić, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Goran Trbić, Republic of Srpska, Bosnia and Herzegovina
4. Zoran Maunaga, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina