Vasanta Kumar Pai, K., et al. “Reductive Cleavage of Certain Azo Dyes by Electrolytically Generated Vanadium (II) in Aqueous Acid Media”. Asian Journal of Chemistry, vol. 10, no. 1, Mar. 2010, pp. 99-102, https://asianpubs.org/index.php/ajchem/article/view/23556.