MOHAN PRASAD, CHANDRA, et al. “Kinetics and Mechanism of Oxidation of Oxalic Acid With Bi(V) in HClO4-HF Mixture”. Asian Journal of Chemistry, vol. 19, no. 2, Mar. 2010, pp. 1103-8, https://asianpubs.org/index.php/ajchem/article/view/20177.