Missing [C ii] emission from early galaxies. - Carniani, S; Ferrara, A; Maiolino, R; Castellano, M; Gallerani, S; Fontana, A; Kohandel, M; Lupi, A; Pallottini, A; Pentericci, L; Vallini, L; Vanzella, E (Monthly Notices of the Royal Astronomical Society, 2020)