Fahad, M. R., and B. A. Abdulmajeed. “Surface Modification of TiO?-Al?O? Nanoparticles for the Enhancement of the Rheological Properties of Base Lubricating Oil”. Journal of Applied Research and Technology, vol. 20, no. 1, Mar. 2022, pp. 37-47, doi:10.22201/icat.24486736e.2022.20.1.1556.