Luminous and high-frequency peaked blazars: the origin of the γ-ray emission from PKS 1424+240 M. Cerruti, W. Benbow, X. Chen, J. P. Dumm, L. F. Fortson and K. Shahinyan A&A, 606 (2017) A68 Published online: 11 October 2017 DOI: 10.1051/0004-6361/201730799