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Lorenza Levy, James A. Rose, Jacqueline H. van Gorkom et Brian Chaboyer, « The Effect of Cluster Environment on Galaxy Evolution in the Pegasus I Cluster », The Astronomical Journal, vol. 133, no 3, , p. 1104 (DOI10.1086/510723, Bibcode2007AJ....133.1104L, lire en ligne [PDF])
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Lorenza Levy, James A. Rose, Jacqueline H. van Gorkom et Brian Chaboyer, « The Effect of Cluster Environment on Galaxy Evolution in the Pegasus I Cluster », The Astronomical Journal, vol. 133, no 3, , p. 1104 (DOI10.1086/510723, Bibcode2007AJ....133.1104L, lire en ligne [PDF])