1. Chair of Silviculture; Faculty of Environment and Natural Resources; Freiburg University; Tennenbacherstr. 4 79108 Freiburg Germany
2. Faculty of Forestry; Stefan cel Mare University of Suceava; Strada Universității 13 720229 Suceava Romania
3. National Institute for Research and Development in Silviculture; National Forest Inventory; 73b Calea Bucovinei 725100 Campulung Moldovenesc Romania