Carollo, C. M.; Stiavelli, M.; de Zeeuw, P. T.; Mack, J. (December 1997). "Spiral Galaxies with WFPC2.I.Nuclear Morphology, Bulges, Star Clusters, and Surface Brightness Profiles". The Astronomical Journal. 114: 2366. Bibcode:1997AJ....114.2366C. doi:10.1086/118654.
Afanasiev, V. L.; Sil’chenko, O. K. (January 2000). "Young Stellar Nuclei in the Lenticular Galaxies. II. NGC 7280". The Astronomical Journal. 119 (1): 126–135. Bibcode:2000AJ....119..126A. doi:10.1086/301162.
Duprie, Kimberly; Schneider, Stephen E. (September 1996). "Neutral Hydrogen Around Early-Type Galaxies". The Astronomical Journal. 112: 937. Bibcode:1996AJ....112..937D. doi:10.1086/118067.
Carollo, C. M.; Stiavelli, M.; de Zeeuw, P. T.; Mack, J. (December 1997). "Spiral Galaxies with WFPC2.I.Nuclear Morphology, Bulges, Star Clusters, and Surface Brightness Profiles". The Astronomical Journal. 114: 2366. Bibcode:1997AJ....114.2366C. doi:10.1086/118654.
Afanasiev, V. L.; Sil’chenko, O. K. (January 2000). "Young Stellar Nuclei in the Lenticular Galaxies. II. NGC 7280". The Astronomical Journal. 119 (1): 126–135. Bibcode:2000AJ....119..126A. doi:10.1086/301162.
Duprie, Kimberly; Schneider, Stephen E. (September 1996). "Neutral Hydrogen Around Early-Type Galaxies". The Astronomical Journal. 112: 937. Bibcode:1996AJ....112..937D. doi:10.1086/118067.