EPR characterization of Cr3+ and Cr5+ ions in TiO2-anatase as matrice A Aboukaïs, M Dourdin, FC Aïssi, M Guelton and JC Vedrine J. Chim. Phys., 91 (1994) 748-752 Published online: 29 May 2017 DOI: 10.1051/jcp/1994910748