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Muñoz, R. P.; Motta, V.; Verdugo, T.; Garrido, F. et al. (11 de diciembre de 2012). «Dynamical analysis of strong-lensing galaxy groups at intermediate redshift». Astronomy & Astrophysics (April 2013) 552: 18. Bibcode:2013A&A...552A..80M. arXiv:1212.2624. doi:10.1051/0004-6361/201118513. A80.
M. Stephan (April 1877). «Nebulæ (new) discovered and observed at the observatory of Marseilles, 1876 and 1877, M. Stephan». Monthly Notices of the Royal Astronomical Society37 (6): 334. Bibcode:1877MNRAS..37..334S. doi:10.1093/mnras/37.6.334.
Hickson, Paul (April 1982). «Systematic properties of compact groups of galaxies». Astrophysical Journal, Part 1255: 382-391. Bibcode:1982ApJ...255..382H. doi:10.1086/159838.
Muñoz, R. P.; Motta, V.; Verdugo, T.; Garrido, F. et al. (11 de diciembre de 2012). «Dynamical analysis of strong-lensing galaxy groups at intermediate redshift». Astronomy & Astrophysics (April 2013) 552: 18. Bibcode:2013A&A...552A..80M. arXiv:1212.2624. doi:10.1051/0004-6361/201118513. A80.
M. Stephan (April 1877). «Nebulæ (new) discovered and observed at the observatory of Marseilles, 1876 and 1877, M. Stephan». Monthly Notices of the Royal Astronomical Society37 (6): 334. Bibcode:1877MNRAS..37..334S. doi:10.1093/mnras/37.6.334.
Hickson, Paul (April 1982). «Systematic properties of compact groups of galaxies». Astrophysical Journal, Part 1255: 382-391. Bibcode:1982ApJ...255..382H. doi:10.1086/159838.