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Gebhardt, Karl; Rich, R. M.; Ho, Luis C., An Intermediate-Mass Black Hole in the Globular Cluster G1: Improved Significance from New Keck and Hubble Space Telescope Observations, The Astrophysical Journal, December 2005, 634 (2): 1093–1102, Bibcode:2005ApJ...634.1093G, arXiv:astro-ph/0508251, doi:10.1086/497023
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Schoedel, R.; A. Eckart, C. Iserlohe, R. Genzel, T. Ott. A Black Hole in the Galactic Center Complex IRS 13E?. Astrophys. J. 2005, 625: L111–L114. doi:10.1086/431307.
Gebhardt, Karl; Rich, R. M.; Ho, Luis C., An Intermediate-Mass Black Hole in the Globular Cluster G1: Improved Significance from New Keck and Hubble Space Telescope Observations, The Astrophysical Journal, December 2005, 634 (2): 1093–1102, Bibcode:2005ApJ...634.1093G, arXiv:astro-ph/0508251, doi:10.1086/497023