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- "Scientists find proof a black hole is lurking at the centre of our galaxy" (in en-GB). Metro. 2018-10-31. https://metro.co.uk/2018/10/31/scientists-find-proof-a-supermassive-black-hole-is-lurking-at-the-centre-of-the-milky-way-8092994/. Retrieved 2018-10-31.
- "A 'mind-boggling' telescope observation has revealed the point of no return for our galaxy's monster black hole". The Middletown Press. 2018-10-31. https://www.middletownpress.com/technology/businessinsider/article/Supermassive-black-holes-gorge-themselves-on-a-7971243.php. Retrieved 2018-10-31.
- Plait, Phil (2018-11-08). "Astronomers see material orbiting a black hole *right* at the edge of forever" (in English). Syfy Wire. Archived from the original on 10 November 2018. https://web.archive.org/web/20181110143143/https://www.syfy.com/syfywire/astronomers-see-material-orbiting-a-black-hole-right-at-the-edge-of-forever.
- Henderson, Mark (2009-12-09). Astronomers confirm black hole at the heart of the Milky Way. Archived from the original on 2008-12-16. https://web.archive.org/web/20081216235509/http://www.timesonline.co.uk/tol/news/uk/science/article5316001.ece. Retrieved 2019-06-06.
- Gillessen, S.; Eisenhauer, F.; Fritz, T.K.; Pfuhl, O.; Genzel, R. (2013). "The distance to the Galactic Center". Advancing the Physics of Cosmic Distances, Proceedings of the International Astronomical Union, IAU Symposium, Volume 289 8: 29–35. .