Nakayama, Chieko, and Yoshinori Tanaka. “Adsorption of Nitrate As a Groundwater Pollutant by Soil Particles”. Journal of Nepal Geological Society 34 (October 9, 2006): 141–146. Accessed August 17, 2024. https://nepjol.info/index.php/JNGS/article/view/31890.