Choupanian, Ahmad, Gheitury, Mohammad, Heshmati, Mosayeb, Mahdavi, Khadijed, Mahdavi, Mohammad. “Effects of Topographic Factors on Carbon Sequestration in Astragalus Gossypinus (Case Study of Bazan Region, Kermanshah Province).” Journal of Rangeland Science, vol. 2, no. 3, 2012, pp. 577-582.