^Cite error: The named reference Blantonetal2001 was invoked but never defined (see the help page).
^Rampazzo, R.; Plana, H.; Longhetti, M.; Amram, P.; et al. (August 2003), "Warm gas kinematics in shell galaxies", Monthly Notices of the Royal Astronomical Society, 343 (3): 819–830, Bibcode:2003MNRAS.343..819R, doi:10.1046/j.1365-8711.2003.06721.x
^Ferguson, Henry C.; Sandage, Allan (July 1990), "Population studies in groups and clusters of galaxies. III - A catalog of galaxies in five nearby groups", Astronomical Journal, 100: 1–31, Bibcode:1990AJ....100....1F, doi:10.1086/115486