Adolphe, Kouoh Sone Paul-Michel, et al. “Kinetics and Equilibrium Studies of the Adsorption of Nickel (II) Ions from Aqueous Solution onto Modified Natural and Synthetic Iron Oxide”. International Journal of Basic and Applied Sciences, vol. 4, no. 3, June 2015, pp. 277-8, https://doi.org/10.14419/ijbas.v4i3.4721.