Bellazzini, M.; Ibata, R. A.; Chapman, S. C.; Mackey, A. D.; i dr. 2008. The Nucleus of the Sagittarius Dsph Galaxy and M54: a Window on the Process of Galaxy Nucleation. The Astronomical Journal (engleski). 136 (3): 1147–1170. arXiv:0807.0105. Bibcode:2008AJ....136.1147B. doi:10.1088/0004-6256/136/3/1147
Bellazzini, M.; Ibata, R. A.; Chapman, S. C.; Mackey, A. D.; i dr. 2008. The Nucleus of the Sagittarius Dsph Galaxy and M54: a Window on the Process of Galaxy Nucleation. The Astronomical Journal (engleski). 136 (3): 1147–1170. arXiv:0807.0105. Bibcode:2008AJ....136.1147B. doi:10.1088/0004-6256/136/3/1147
Bellazzini, M.; Ibata, R. A.; Chapman, S. C.; Mackey, A. D.; i dr. 2008. The Nucleus of the Sagittarius Dsph Galaxy and M54: a Window on the Process of Galaxy Nucleation. The Astronomical Journal (engleski). 136 (3): 1147–1170. arXiv:0807.0105. Bibcode:2008AJ....136.1147B. doi:10.1088/0004-6256/136/3/1147