Author(s):
1. Branko Stajiić, University of Belgrade-Faculty of Forestry, , Serbia
2. Marko Kazimirović, University of Belgrade-Faculty of Forestry, , Serbia
3. Vojislav Dukić, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Živan Janjatović, University of Belgrade-Faculty of Forestry, , Serbia