Moosa, A. A., Z. H. Mahdi, and M. A. Mutar. “Preparation of Graphene Oxide from Expanded Graphite at Different Microwave Heating Times ”. Journal of Engineering and Technological Sciences, vol. 53, no. 3, June 2021, p. 210305, doi:10.5614/j.eng.technol.sci.2021.53.3.5.