Mayowa Onipede, Enahoro, P.O., Oshodi, and A.A. 2015. “Adsorption Equilibrium Study of Lead and Zinc on Rice Husk From Aqueous Solution”. Global Journal of Science Frontier Research 15 (B1):9-18. https://journalofscience.org/index.php/GJSFR/article/view/1481.