1. Forest & Landscape; University of Copenhagen; Frederiksberg C Denmark
2. USDA Forest Service; Northern Research Station; Hamden CT USA
3. Forestry Faculty; Duzce University; Duzce Turkey
4. Agriculture and Agri-Food Canada; Eastern Cereal and Oilseed Research Centre; Ottawa ONT Canada
5. The Western Black Sea Forestry Research Institute; The Ministry of Forestry and Water Affairs; Bolu Turkey
6. Department of Biology; Faculty of Science and Arts; Abant İzzet Baysal University; Bolu Turkey
7. CABI Europe-Switzerland; Delémont Switzerland