Shen, Q., L. Xu, Y. Jiang, R. Zheng, and Y. Zhang. “Synthesis of Benzil by Air Oxidation of Benzoin and M(Salen) Catalyst”. International Research Journal of Pure and Applied Chemistry, Vol. 19, no. 1, June 2019, pp. 1-8, doi:10.9734/irjpac/2019/v19i130100.