Evolution of the X-ray spectrum in the flare model of Active Galactic Nuclei S. Collin, S. Coupé, A.-M. Dumont, P.-O. Petrucci and A. Różańska A&A, 400 2 (2003) 437-449 Published online: 03 March 2003 DOI: 10.1051/0004-6361:20030063