Rehman, Rabia, et al. “Adsorptive Elimination of Chromium(III) and Nickel(II) from Water by Spent Eugenia Jambolana Leaves: Isothermal and Thermodynamical Studies”. Asian Journal of Chemistry, vol. 26, no. 3, Jan. 2014, pp. 644-8, doi:10.14233/ajchem.2014.15460.