%0 Journal Article
%A et The EHT Collaboration al.
%B ApJL
%D 2019
%G eng
%P 4
%T First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
%U https://iopscience.iop.org/article/10.3847/2041-8213/ab0e85
%V 875