Skrutskie, M. F.; Cutri, R. M.; Stiening, R.; Weinberg, M. D.; Schneider, S.; Carpenter, J. M.; Beichman, C.; Capps, R.; et al. (February 2006), ”The Two Micron All Sky Survey (2MASS)”, Astrophysical Journal 131 (2): 1163-1183, doi:10.1086/498708, Bibcode: 2006AJ....131.1163S.
Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. (February 2007), ”Groups of Galaxies in the Two Micron All Sky Redshift Survey”, The Astrophysical Journal 655: 790–813, doi:10.1086/510201, Bibcode: 2007ApJ...655..790C.
Coccato, L.; Morelli, L.; Pizzella, A.; Corsini, E. M.; Buson, L. M.; Dalla Bontà, E. (January 2013), ”Spectroscopic evidence of distinct stellar populations in the counter-rotating stellar disks of NGC 3593 and NGC 4550”, Astronomy & Astrophysics 549: A3, doi:10.1051/0004-6361/201220460, Bibcode: 2013A&A...549A...3C.
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Skrutskie, M. F.; Cutri, R. M.; Stiening, R.; Weinberg, M. D.; Schneider, S.; Carpenter, J. M.; Beichman, C.; Capps, R.; et al. (February 2006), ”The Two Micron All Sky Survey (2MASS)”, Astrophysical Journal 131 (2): 1163-1183, doi:10.1086/498708, Bibcode: 2006AJ....131.1163S.
Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. (February 2007), ”Groups of Galaxies in the Two Micron All Sky Redshift Survey”, The Astrophysical Journal 655: 790–813, doi:10.1086/510201, Bibcode: 2007ApJ...655..790C.
Coccato, L.; Morelli, L.; Pizzella, A.; Corsini, E. M.; Buson, L. M.; Dalla Bontà, E. (January 2013), ”Spectroscopic evidence of distinct stellar populations in the counter-rotating stellar disks of NGC 3593 and NGC 4550”, Astronomy & Astrophysics 549: A3, doi:10.1051/0004-6361/201220460, Bibcode: 2013A&A...549A...3C.
