Buta, Ronald J.; Byrd, Gene G.; Freeman, Tarsh (February 2003). "The Ringed Spiral Galaxy NGC 4622. I. Photometry, Kinematics, and the Case for Two Strong Leading Outer Spiral Arms". The Astronomical Journal. 125 (2): 634–666. arXiv:astro-ph/0211002. doi:10.1086/345821.
Treuthardt, Patrick; Seigar, Marc S.; Sierra, Amber D.; Al-Baidhany, Ismaeel; Salo, Heikki; Kennefick, Daniel; Kennefick, Julia; Lacy, Claud H. S. (11 July 2012). "On the link between central black holes, bar dynamics and dark matter haloes in spiral galaxies: SMBHs, bar dynamics, and DM haloes". Monthly Notices of the Royal Astronomical Society. 423 (4): 3118–3133. arXiv:1204.4210. doi:10.1111/j.1365-2966.2012.21118.x.
Buta, Ronald J.; Byrd, Gene G.; Freeman, Tarsh (February 2003). "The Ringed Spiral Galaxy NGC 4622. I. Photometry, Kinematics, and the Case for Two Strong Leading Outer Spiral Arms". The Astronomical Journal. 125 (2): 634–666. arXiv:astro-ph/0211002. doi:10.1086/345821.
Treuthardt, Patrick; Seigar, Marc S.; Sierra, Amber D.; Al-Baidhany, Ismaeel; Salo, Heikki; Kennefick, Daniel; Kennefick, Julia; Lacy, Claud H. S. (11 July 2012). "On the link between central black holes, bar dynamics and dark matter haloes in spiral galaxies: SMBHs, bar dynamics, and DM haloes". Monthly Notices of the Royal Astronomical Society. 423 (4): 3118–3133. arXiv:1204.4210. doi:10.1111/j.1365-2966.2012.21118.x.