E. El-Mossalamy1, M. El-Batouti2, T. Ahmed3, L. Al-Harbi3, N. Al Harby4, and A. Al-Owais5, “Preparation and Physico-Chemical Characterization of Modified Acidic and Basic Metal Oxide Catalysts”, ajc, vol. 27, no. 10, pp. 3625–3632, Jun. 2015.