S. P. Rajappan, M. Babu, A. N. Manoharan, and H. Manohar, “Landslide susceptibility evaluation of Iruvazhinji watershed of Chaliyar River, Central Kerala, India, using frequency ratio approach”, J. Degrade. Min. Land Manage., vol. 12, no. 2, pp. 7111–7122, Jan. 2025.