BeppoSAX spectroscopy of MR 2251-178: A test for ionized reflection in radio quiet QSOs A. Orr, P. Barr, M. Guainazzi, A. N. Parmar and A. J. Young A&A, 376 2 (2001) 413-421 Published online: 15 September 2001 DOI: 10.1051/0004-6361:20011025