Schödel, R.; Ott, T.; Genzel, R.; Hofmann, R.; Lehnert, M.; Eckart, A.; Mouawad, N.; Alexander, T.; Reid, M. J.; Lenzen, R.; Hartung, M.; Lacombe, F.; Rouan, D.; Gendron, E.; Rousset, G.; Lagrange, A.-M.; Brandner, W.; Ageorges, N.; Lidman, C.; Moorwood, A. F. M.; Spyromilio, J.; Hubin, N.; Menten, K. M. (2002). "A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way". Nature. 419 (6908): 694–696. doi:10.1038/nature01121.
Zucker, S.; Alexander, T.; Gillessen, S.; Eisenhauer, F.; Genzel, R. (2006). "Probing Post-Newtonian Physics near the Galactic Black Hole with Stellar Redshift Measurements". The Astrophysical Journal Letters. 639 (1): L21–L24. doi:10.1086/501436.
Abuter, R. (2018). "Detection of the Gravitational Redshift in the Orbit of the Star S2 near the Galactic Centre Massive Black Hole". Astronomy and Astrophysics. 615: L15. doi:10.1051/0004-6361/201833718.