Optical characterization of sol gel TiO2 monoliths doped with Brilliant Green S. A. Tomás, O. Zelaya, R. Palomino, R. Lozada, O. García, J. M. Yáñez and A. Ferreira da Silva Eur. Phys. J. Special Topics, 153 (2008) 255-258 Published online: 12 March 2008 DOI: 10.1140/epjst/e2008-00439-y