Nodehi, Negin, Akbarlou, Mousa, Sepehry, Adel, Vahid, Hasan. “Investigation of Stability and Relationships between Species Diversity Indices and Topographical Factors (Case Study: Ghorkhud Mountainous Rangeland, Northern Khorasan Province, Iran).” Journal of Rangeland Science, vol. 5, no. 3, 2015, pp. 192-201.