@article {1448414,
	title = {Universal Interferometric Signatures of a Black Hole{\textquoteright}s Photon Ring},
	journal = {Science Advances},
	volume = {6},
	number = {12},
	year = {2020},
	url = {https://advances.sciencemag.org/content/6/12/eaaz1310/tab-pdf},
	author = {Johnson, Michael D. and Alexandru Lupsasca and Andrew Strominger and George N. Wong and Shahar Hadar and Daniel Kapec and Ramesh Narayan and et al.}
}
