Vigil, E., 		Ayllón, J. A., 		Sánchez, S., AND 		Azúa, L..
"Novel Nanocrystalline CuO-TiO2 Composite: Electron Injection from CuO to TiO2 illuminating with Visible Light without Polarization Voltage" <em>Revista Cubana de Física</em> [Online], Volume 26 Number 2A (5 December 2009)