1. Department of Forest Engineering, Forest Management Planning and Terrestrial Measurements, Faculty of Silviculture and Forest Engineering, Transilvania University of Brasov, Şirul Beethoven 1, 500123 Brasov, Romania
2. Faculty of Natural Resources, Escuela Superior Politécnica de Chimborazo, Panamericana Sur, km 1 ½, Riobamba EC-060155, Ecuador