Eric W. Peng, Andrés Jordán, Patrick Côté et et al., « The ACS Virgo Cluster Survey. XV. The Formation Efficiencies of Globular Clusters in Early-Type Galaxies: The Effects of Mass and Environment », The Astrophysical Journal, vol. 681, no 1, , p. 197-224 (DOI10.1086/587951, Bibcode2008ApJ...681..197P, lire en ligne)
B. Binggeli, A. Sandage et G.A. Tammann, « Studies of the Virgo cluster. II. A catalog of 2096 galaxies in the Virgo cluster area. », Astronomical Journal, vol. 90, , p. 1681-1758 (DOI10.1086/113874, Bibcode1985AJ.....90.1681B)
Eric W. Peng, Andrés Jordán, Patrick Côté et et al., « The ACS Virgo Cluster Survey. XV. The Formation Efficiencies of Globular Clusters in Early-Type Galaxies: The Effects of Mass and Environment », The Astrophysical Journal, vol. 681, no 1, , p. 197-224 (DOI10.1086/587951, Bibcode2008ApJ...681..197P, lire en ligne)
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B. Binggeli, A. Sandage et G.A. Tammann, « Studies of the Virgo cluster. II. A catalog of 2096 galaxies in the Virgo cluster area. », Astronomical Journal, vol. 90, , p. 1681-1758 (DOI10.1086/113874, Bibcode1985AJ.....90.1681B)
Eric W. Peng, Andrés Jordán, Patrick Côté et et al., « The ACS Virgo Cluster Survey. XV. The Formation Efficiencies of Globular Clusters in Early-Type Galaxies: The Effects of Mass and Environment », The Astrophysical Journal, vol. 681, no 1, , p. 197-224 (DOI10.1086/587951, Bibcode2008ApJ...681..197P, lire en ligne)