γ-rays in flat-spectrum AGN: revisiting the fast jet hypothesis with the CJF sample M. Karouzos, S. Britzen, A. Witzel, J. A. Zensus and A. Eckart A&A, 529 (2011) A16 Published online: 22 March 2011 DOI: 10.1051/0004-6361/201015984