XMM-Newton observations reveal AGN in apparently normal galaxies P. Severgnini, A. Caccianiga, V. Braito, R. Della Ceca, T. Maccacaro, A. Wolter, K. Sekiguchi, T. Sasaki, M. Yoshida, M. Akiyama et al. (5 more) A&A, 406 2 (2003) 483-492 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20030625