Al-Tabbakh, B.A.A., Jaed, D.M., Qubian, N.A. and Kareem, S. 2022. Preparation of CuO Nanoparticles for Improving Base Oil Properties. Journal of Petroleum Research and Studies. 12, 1 (Mar. 2022), 191-205. DOI:https://doi.org/10.52716/jprs.v12i1.598.