Vasic, Marija B., et al. “Decolorization of Crystal Violet over TiO2 and TiO2 Doped With Zirconia Photocatalysts”. HEMIJSKA INDUSTRIJA (Chemical Industry), vol. 71, no. 3, July 2017, pp. 259-6, https://doi.org/10.2298/HEMIND160521036V.