J. M. Patra, S. S. Panda, and N. K. Dhal. “Biochar As a Low-Cost Adsorbent for Heavy Metal Removal: A Review”. International Journal of Research in BioSciences (IJRBS) 6, no. 1 (August 22, 2020): 1-7. Accessed May 4, 2024. http://www.ijrbs.in/index.php/ijrbs/article/view/232.