Alabbad, Saad, et al. “Liquid Phase Selective Oxidation of Aromatic Alcohols Employing Nanoparticles of Zirconia Supported on Nickel Manganese Oxide: Synthesis, Characterization and Catalytic Evaluation”. Asian Journal of Chemistry, vol. 25, no. 16, Oct. 2013, pp. 8927-32, doi:10.14233/ajchem.2013.14911.