The Parkes quarter-Jansky flat-spectrum sample - III. Space density and evolution of QSOs J. V. Wall, C. A. Jackson, P. A. Shaver, I. M. Hook and K. I. Kellermann A&A, 434 1 (2005) 133-148 Published online: 01 April 2005 DOI: 10.1051/0004-6361:20041786