Author(s):
1. Milan Mataruga, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Vanja Daničić, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Barbara Fussi, Bayerisches Amt für forstliche Saat- und Pflanzenzucht, Germany
4. Branislav Cvjetković, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
5. Vasilije Isajev, Serbia