00344nas a2200121   4500000000100000000000100001008004100002100002200043245007100065856006700136300001300203490000600216       2020                            d1 aet M. Johnson al.00aUniversal interferometric signatures of a black hole's photon ring  uhttps://ui.adsabs.harvard.edu/abs/2020SciA....6.1310J/abstract  aeaaz13100 v6