Rahman, Ghani, et al. “Geospatial Analysis of Landslide Susceptibility and Zonation in Shahpur Valley, Eastern Hindu Kush Using Frequency Ratio Model: Geospatial Analysis of Landslide Susceptibility”. Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences, vol. 54, no. 3, Sept. 2017, pp. 149-63, http://ppaspk.org/index.php/PPAS-B/article/view/400.