The Chandra deep field South/GOODS survey - Optically faint X-ray sources V. Mainieri, P. Rosati, P. Tozzi, J. Bergeron, R. Gilli, G. Hasinger, M. Nonino, I. Lehmann, D. M. Alexander, R. Idzi et al. (4 more) A&A, 437 3 (2005) 805-821 Published online: 30 June 2005 DOI: 10.1051/0004-6361:20041212