Author(s):
1. Vladimir Petković, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Dane Marčeta, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Darko Ljubojević, JPŠ Šume Republike Srpske, ŠG Prijedor, Republic of Srpska, Bosnia and Herzegovina
4. Potočnik Igor, Biotechnical Faculty, University of Ljubljana, Slovenia