Eshtiagh-Hosseini, Hossein, et al. “Application of Copper(II) Schiff Base Complex Grafted in the Silica Network As Efficient Nanocatalyst in Oxidation of Alcohols”. Asian Journal of Chemistry, vol. 25, no. 6, Jan. 2013, pp. 3307-12, doi:10.14233/ajchem.2013.13644.