The X-ray spectral properties of the AGN population in the XMM-Newton bright serendipitous survey A. Corral, R. Della Ceca, A. Caccianiga, P. Severgnini, H. Brunner, F. J. Carrera, M. J. Page and A. D. Schwope A&A, 530 (2011) A42 Published online: 05 May 2011 DOI: 10.1051/0004-6361/201015227