The Proper Motion of Sagittarius A*. III. The Case for a Supermassive Black Hole2020DOI: info:10.3847/1538-4357/ab76cdThe Astrophysical Journalv. 892 39 39
Reid, Mark J. and Brunthaler, A. 2020. "The Proper Motion of Sagittarius A*. III. The Case for a Supermassive Black Hole." The Astrophysical Journal 892: 39. https://doi.org/10.3847/1538-4357/ab76cd