Romano, R.; Mayya, Y. D.; Vorobyov, E. I. (1 September 2008). "STELLAR DISKS OF COLLISIONAL RING GALAXIES. I. NEW MULTIBAND IMAGES, RADIAL INTENSITY AND COLOR PROFILES, AND CONFRONTATION WITH N -BODY SIMULATIONS". The Astronomical Journal. 136 (3): 1259–1289. arXiv:0807.1477. Bibcode:2008AJ....136.1259R. doi:10.1088/0004-6256/136/3/1259.
Joy, Marshall; Ellis, H. B., Jr.; Tollestrup, E. V.; Brock, D.; Higdon, J. L.; Harvey, P. M. (July 1988). "The genesis of the ring galaxy ARP 144 (NGC 7828/29)". The Astrophysical Journal. 330: L29. Bibcode:1988ApJ...330L..29J. doi:10.1086/185198.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Romano, R.; Mayya, Y. D.; Vorobyov, E. I. (1 September 2008). "STELLAR DISKS OF COLLISIONAL RING GALAXIES. I. NEW MULTIBAND IMAGES, RADIAL INTENSITY AND COLOR PROFILES, AND CONFRONTATION WITH N -BODY SIMULATIONS". The Astronomical Journal. 136 (3): 1259–1289. arXiv:0807.1477. Bibcode:2008AJ....136.1259R. doi:10.1088/0004-6256/136/3/1259.
Joy, Marshall; Ellis, H. B., Jr.; Tollestrup, E. V.; Brock, D.; Higdon, J. L.; Harvey, P. M. (July 1988). "The genesis of the ring galaxy ARP 144 (NGC 7828/29)". The Astrophysical Journal. 330: L29. Bibcode:1988ApJ...330L..29J. doi:10.1086/185198.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Romano, R.; Mayya, Y. D.; Vorobyov, E. I. (1 September 2008). "STELLAR DISKS OF COLLISIONAL RING GALAXIES. I. NEW MULTIBAND IMAGES, RADIAL INTENSITY AND COLOR PROFILES, AND CONFRONTATION WITH N -BODY SIMULATIONS". The Astronomical Journal. 136 (3): 1259–1289. arXiv:0807.1477. Bibcode:2008AJ....136.1259R. doi:10.1088/0004-6256/136/3/1259.