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Cassisi, S.; Marín-Franch, A.; Salaris, M.; Aparicio, A.; Monelli, M.; Pietrinferni, A. (2011). "The magnitude difference between the main sequence turn off and the red giant branch bump in Galactic globular clusters". Astronomy & Astrophysics. 527: A59. arXiv:1012.0419. Bibcode:2011A&A...527A..59C. doi:10.1051/0004-6361/201016066. S2CID56067351.
Cassisi, S.; Marín-Franch, A.; Salaris, M.; Aparicio, A.; Monelli, M.; Pietrinferni, A. (2011). "The magnitude difference between the main sequence turn off and the red giant branch bump in Galactic globular clusters". Astronomy & Astrophysics. 527: A59. arXiv:1012.0419. Bibcode:2011A&A...527A..59C. doi:10.1051/0004-6361/201016066. S2CID56067351.