Fabrega, C.; Andreu, T.; Cabot, A.; Morante, J.R. "Location and catalytic role of iron species in TiO2:Fe photocatalysts: An EPR study" Journal of Photochemistry and Photobiology A: Chemistry 211, 42431, pp. 170 - 175. 2010 DOI: 10.1016/j.jphotochem.2010.03.003