XMM-Newton detection of a Comptonized accretion disc in the quasar PKS 0558-504 P. T. O'Brien, J. N. Reeves, M. J. L. Turner, K. A. Pounds, M. Page, M. Gliozzi, W. Brinkmann, J. B. Stephen and M. Dadina A&A, 365 1 (2001) L122-L127 Published online: 15 January 2001 DOI: 10.1051/0004-6361:20000215