Huang, L.J., et al. “Degradation of Azo Dyes Wastewater Using Chlorine Dioxide and A Ternary Catalyst NiO-CuOx-La2O3 Al2O3”. Asian Journal of Chemistry, vol. 24, no. 4, Dec. 2011, pp. 1727-30, https://asianpubs.org/index.php/ajchem/article/view/8869.