T. T. H. Nguyen, V. T. Luong, M. C. Hoang, Q. M. Ta, T. H. Nguyen, and VuV. H., “Synthesis of graphene oxide as a high-temperature fluid-loss-control additive in water-based drilling fluids from Vietnamese graphite”, PVJ, vol. 8, pp. 41 - 50, Aug. 2015.