@article {1444448,
	title = {First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole},
	journal = {The Astrophysical Journal Letters},
	volume = {875},
	year = {2019},
	pages = {4},
	url = {https://iopscience.iop.org/article/10.3847/2041-8213/ab0e85},
	author = {The EHT Collaboration et al.}
}
