The BL-Lac gamma-ray blazar PKS 0447-439 as a probable member of a group of galaxies at z = 0.343H. Muriel, C. Donzelli, A. C. Rovero and A. PichelA&A, 574 (2015) A101DOI: https://doi.org/10.1051/0004-6361/201425050
