Azizkhani, Sepehr, et al. “Removal of Cadmium (II) by Graphene Oxide-Chitosan Adsorbent from Aqueous Solution”. International Journal of Engineering & Technology, vol. 7, no. 3.26, Aug. 2018, pp. 5-8, https://doi.org/10.14419/ijet.v7i3.26.17450.