Discovery of a giant and luminous Lyalpha+CIV+HeII nebula at z=3.326 with extreme emission line ratios - Marques-Chaves, R; Pérez-Fournon, I; Villar-Martín, M; Gavazzi, R; Riechers, D; Rigopoulou, D; Wardlow, J; Cabrera-Lavers, A; Clements, D; Colina, L; Cooray, A; Farrah, D; et al. (EDP Sciences, 2019)