1. Adelpur. A. 2004. An investigation on hydraulic thresholds of gully erosion in different landuses in the loamy sand soils, PhD thesis, Faculty of Science and Engineering of Water, Chamran University, 194 pp.
2. Agharazi, H., A. Davudirad, M. Mardian and M. Soufi. 2014. 'Investigation of area slope threshold of gullies in the Zahirabad Watershed, Shazand, Markazi Province', Watershed Engineering and Management, 6(1): 1-9.
3. Ahmai. H. 2011. Aplied Geomorphology (vol. 2; water erosion), 3rd edi. Tehran University. Peress. 688 pp (In Persian).
4. Akbari, M., M. Bashiri and A. Rangavar. 2017. Application of Data-Mining Algorithms in the Sensitivity Analysis and Zoning of Areas Prone to Gully Erosion in the Indicator Watersheds of Khorasan Razavi Province. Environment Erosion Research, 7(2): 16-42 (In Persian).
5. Borchardt, G. 1989. Smectites, in: Bighman, J.M., Dixon, J.B., Milford, M.H., Roth, C.B., Weed, S.B. (Eds.), Minerals in Soil Environments. Soil Sci. Soc. Am., Madison, Washington, pp: 728-767.