The BL-Lacertae gamma-ray blazar PKS 1424+240 associated with a group of galaxies at z = 0.6010A. C. Rovero, H. Muriel, C. Donzelli and A. PichelA&A, 589 (2016) A92DOI: https://doi.org/10.1051/0004-6361/201527778
