1. National Institute for Research and Development in Forestry “Marin Drăcea”, Voluntari, Romania; Faculty of Silviculture and Forest Engineering, “Transilvania” University of Braşov, Brașov, Romania
2. National Institute for Research and Development in Forestry “Marin Drăcea”, Voluntari, Romania
3. National Institute for Research and Development in Forestry “Marin Drăcea”, Voluntari, Romania; Faculty of Silviculture and Forest Engineering, “Transilvania” University of Braşov, 500123 Brașov, Romania