Qaiser, S., A. R. Saleemi, and M. Umar. “Biosorption of lead(II) and chromium(VI) on Groundnut Hull: Equilibrium, Kinetics and Thermodynamics Study”. Electronic Journal of Biotechnology, vol. 12, no. 4, Oct. 2009, pp. 0-0, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v12n4-6.