Electronic structure of C co-doped (Ga, Fe)N-based diluted magnetic semiconductors O. Mounkachi, A. Benyoussef, A. El Kenz, E. H. Saidi and E. K. Hlil Eur. Phys. J. B, 74 4 (2010) 463-466 Published online: 13 April 2010 DOI: 10.1140/epjb/e2010-00124-4