00374nas a2200121   4500000000100000000000100001008004100002100002900043245010100072856006400173300000700237490000800244       2021                            d1 aet EHT Collaboration al.00aFirst M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon  uhttps://iopscience.iop.org/article/10.3847/2041-8213/abe4de  a430 v910