Xu, Xingzhi, et al. “Adsorption of Zn(II) by Corncob Microwave Pretreated and Modified With Succinic Anhydride”. Asian Journal of Chemistry, vol. 22, no. 8, June 2010, pp. 6245-51, https://asianpubs.org/index.php/ajchem/article/view/11808.