Mills, A., and M. Valenzuela. “Photo-Oxidation of Water Sensitized by TiO$_2$ and WO$_3$ in Presence of Different Electron Acceptors”. Revista Mexicana De Física, vol. 50, no. 3, Jan. 2004, pp. 287-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3255.