Lyman-$α$ emission from a WISE-selected optically faint powerful radio galaxy M151304.72-252439.7 at $z$ = 3.132 [GA] arXiver, 06 Jan 2021 http://arxiv.org/abs/2101.01192 We report the detection of a large ($\sim90$ kpc) and luminous $\mathrm{Ly\a…