Johannsen, Tim; Psaltis, Dimitrios; Gillessen, Stefan; Marrone, Daniel P.; Özel, Feryal; Doeleman, Sheperd S.; Fish, Vincent L. (10 October 2012). "Masses of Nearby Supermassive Black Holes with Very Long Baseline Interferometry". The Astrophysical Journal. 758 (1): 30. arXiv:1201.0758. Bibcode:2012ApJ...758...30J. doi:10.1088/0004-637X/758/1/30.
Johannsen, Tim; Psaltis, Dimitrios; Gillessen, Stefan; Marrone, Daniel P.; Özel, Feryal; Doeleman, Sheperd S.; Fish, Vincent L. (10 October 2012). "Masses of Nearby Supermassive Black Holes with Very Long Baseline Interferometry". The Astrophysical Journal. 758 (1): 30. arXiv:1201.0758. Bibcode:2012ApJ...758...30J. doi:10.1088/0004-637X/758/1/30.
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Johannsen, Tim; Psaltis, Dimitrios; Gillessen, Stefan; Marrone, Daniel P.; Özel, Feryal; Doeleman, Sheperd S.; Fish, Vincent L. (10 October 2012). "Masses of Nearby Supermassive Black Holes with Very Long Baseline Interferometry". The Astrophysical Journal. 758 (1): 30. arXiv:1201.0758. Bibcode:2012ApJ...758...30J. doi:10.1088/0004-637X/758/1/30.