X-ray emission from the blazar AO 0235+16: the XMM-Newton and Chandra point of view C. M. Raiteri, M. Villata, M. Kadler, T. P. Krichbaum, M. Böttcher, L. Fuhrmann and M. Orio A&A, 452 3 (2006) 845-856 Published online: 06 June 2006 DOI: 10.1051/0004-6361:20054409