Author(s):
1. Dane Marčeta, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Vladimir Petković, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Ozren Žolja, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina