Author(s):
1. Igor Kneginjić, JPŠ Šume Republike Srpske, ŠG Prijedor, Republic of Srpska, Bosnia and Herzegovina
2. Vladimir Stupar, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Rade Cvjetića, Šumarski fakultet Beograd, Serbia
4. Milan Knežević, Šumarski fakultet Beograd, Serbia