Castillo, J. H., F. J. Rodriguez, A. López-Malo, E. Sanchez-Mora, M. A. Quiroz, and E. R. Bandala. “Synthesis, Structural Characterization and Photocatalytic Activity of Iron-Doped Titanium Dioxide Nanopowders”. Journal of Technology Innovations in Renewable Energy, vol. 4, no. 1, Mar. 2015, pp. 1-9, doi:10.6000/1929-6002.2015.04.01.1.