Bhavyasree, K. T., and S. Jayasree Sankar. “Distribution of Azolla in Palakkad Eastern Plains (AEU 23)”. Journal of Tropical Agriculture 54, no. 1 (November 7, 2016): 95. Accessed April 1, 2025. https://jtropag.kau.in/index.php/ojs2/article/view/378.