L. K. Yong, P. L. Law, S. N. L. Taib, D. Y. S. Mah, and A. H. Johari, “Refinement of Topographical Factor For Estimating Soil Loss and Sediment Yield in Equatorial Regions”, JCEST, vol. 9, no. 2, p. Paper 4, Oct. 2018.