WANG, Hui, et al. “Graphene Oxide Multi-Walled Carbon Nanotubes Gold Nanoparticle Hybridfunctionalized Disposable Screen-Printed Carbon Electrode to Determine Cd(II) and Pb(II) in Soil”. International Journal of Agricultural and Biological Engineering, vol. 12, no. 3, June 2019, pp. 194-00, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/4300.