Black-hole mass estimates for a homogeneous sample of bright flat-spectrum radio quasars G. Castignani, F. Haardt, A. Lapi, G. De Zotti, A. Celotti and L. Danese A&A, 560 (2013) A28 Published online: 02 December 2013 DOI: 10.1051/0004-6361/201321424