Structural, electronic and optical properties of spinel oxides: cadmium gallate and cadmium indate A. Bouhemadou, R. Khenata, D. Rached, F. Zerarga and M. Maamache Eur. Phys. J. Appl. Phys., 38 3 (2007) 203-210 Published online: 13 June 2007 DOI: 10.1051/epjap:2007094