Ekpete, O. A., Kpee, F., Amadi, J. C., & Rotimi, R. B. (2010). Adsorption of Chromium(VI) and Zinc(II) Ions on the Skin of Orange Peels (<i>Citrus sinensis</i>). Journal of Nepal Chemical Society, 26, 31–39. https://doi.org/10.3126/jncs.v26i0.3628