Antherjanam, G., A. S, and M. Philipose. “A Comparison of Landslide Susceptibility Zonation of Poonjar Sub-Watershed, Kerala by Certainty Factor and Physically Based Methods”. Asian Journal of Engineering and Technology, vol. 3, no. 6, Dec. 2015, https://www.ajouronline.com/index.php/AJET/article/view/3456.