V. R. Liberatti, R. Afonso, A. C. Lucilha, P. R. Catarini da Silva, and L. H. Dall´Antonia, “Methylene blue photocatalysis in the presence of bismuth oxide under UV and solar light irradiation”, Semin., Exact Tech. Scienc., vol. 35, no. 1, pp. 55–62, May 2014.