Albar, A., and M. M. Mohd-Nordin. “Slope Mass Rating (SMR) Classification for Rock Slope Stability and Geohazard Vulnerability Assessment”. International Journal of Integrated Engineering, vol. 14, no. 5, Sept. 2022, pp. 57-65, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/11399.