Deceptively cold dust in the massive starburst galaxy GN20 at z ∼ 4 Isabella Cortzen, Georgios E. Magdis, Francesco Valentino, Emanuele Daddi, Daizhong Liu, Dimitra Rigopoulou, Mark Sargent, Dominik Riechers, Diane Cormier, Jacqueline A. Hodge et al. (6 more) A&A, 634 (2020) L14 Published online: 02 March 2020 DOI: 10.1051/0004-6361/201937217