The six published M87 Event Horizon Papers :-
"First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole" :-
https://iopscience.iop.org/article/1...13/ab0ec7/meta
First M87 Event Horizon Telescope Results. II. Array and Instrumentation :-
https://iopscience.iop.org/article/1...13/ab0c96/meta
"First M87 Event Horizon Telescope Results. III. Data Processing and Calibration" :-
https://iopscience.iop.org/article/1...13/ab0c57/meta
"First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole" -
https://iopscience.iop.org/article/1...13/ab0e85/meta
"First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring" :-
https://iopscience.iop.org/article/1...13/ab0f43/meta
First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole" :-
https://iopscience.iop.org/article/1...13/ab1141/meta