00368nas a2200121   4500000000100000000000100001008004100002100003300043245009200076856006400168300000600232490000800238       2019                            d1 aet The EHT Collaboration al.00aFirst M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole  uhttps://iopscience.iop.org/article/10.3847/2041-8213/ab0ec7  a10 v875