Akinyemi O. P., Alausa O. I., and Kadiri O. M. 2020. “Comparative Study of Impact of Zinc Oxide and Copper (II) Oxide Nanoparticles on Viscosity of Water Based Drilling Fluid”. International Journal of Engineering and Management Research 10 (4), 68-74. https://doi.org/10.31033/ijemr.10.4.11.