Rukmangathan, M., and V. Santhosh Kumar. “Removal of Chromium(VI) from Water by Using Activated Carbon Obtained from Butter Oil Cake”. Asian Journal of Chemistry 21, no. 7 (March 30, 2010): 5273–5276. Accessed July 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/18302.