The ALHAMBRA survey: Discovery of a faint QSO at z = 5.41 I. Matute, J. Masegosa, I. Márquez, A. Fernández-Soto, C. Husillos, A. del Olmo, J. Perea, M. Pović, B. Ascaso, E. J. Alfaro et al. (16 more) A&A, 557 (2013) A78 Published online: 04 September 2013 DOI: 10.1051/0004-6361/201321920