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Hicks, E. K. S. et al. (May 2013), “Fueling Active Galactic Nuclei. I. How the Global Characteristics of the Central Kiloparsec of Seyferts Differ from Quiescent Galaxies”, The Astrophysical Journal768 (2): 107, arXiv:1303.4399, Bibcode: 2013ApJ...768..107H, doi:10.1088/0004-637X/768/2/107
Skrutskie, M. F. et al. (February 2006), “The Two Micron All Sky Survey (2MASS)”, The Astronomical Journal131 (2): 1163–1183, Bibcode: 2006AJ....131.1163S, doi:10.1086/498708
Ocvirk, P. et al. (December 2008), “Extragalactic archeology in integrated light: A test case with NGC 4030”, Astronomische Nachrichten329: 980–983, Bibcode: 2008AN....329..980O, doi:10.1002/asna.200811075
Hicks, E. K. S. et al. (May 2013), “Fueling Active Galactic Nuclei. I. How the Global Characteristics of the Central Kiloparsec of Seyferts Differ from Quiescent Galaxies”, The Astrophysical Journal768 (2): 107, arXiv:1303.4399, Bibcode: 2013ApJ...768..107H, doi:10.1088/0004-637X/768/2/107