Bromley, Benjamin C.; Melia, Fulvio; Liu, Siming (July 1, 2001). "Polarimetric Imaging of the Massive Black Hole at the Galactic Center". The Astrophysical Journal Letters. 555 (2): L83–L86. arXiv:astro-ph/0106180. Bibcode:2001ApJ...555L..83B. doi:10.1086/322862.
Bromley, Benjamin C.; Melia, Fulvio; Liu, Siming (July 1, 2001). "Polarimetric Imaging of the Massive Black Hole at the Galactic Center". The Astrophysical Journal Letters. 555 (2): L83–L86. arXiv:astro-ph/0106180. Bibcode:2001ApJ...555L..83B. doi:10.1086/322862.
Bromley, Benjamin C.; Melia, Fulvio; Liu, Siming (July 1, 2001). "Polarimetric Imaging of the Massive Black Hole at the Galactic Center". The Astrophysical Journal Letters. 555 (2): L83–L86. arXiv:astro-ph/0106180. Bibcode:2001ApJ...555L..83B. doi:10.1086/322862.