%0 Journal Article %J ApJL %D 2019 %T First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring %A The EHT Collaboration et al. %B ApJL %V 875 %P 5 %G eng %U https://iopscience.iop.org/article/10.3847/2041-8213/ab0f43