Messier 68 Referensi
↑ Shapley, Harlow; Sawyer, Helen B. (1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11– 14, Bibcode :1927BHarO.849...11S 1 2 Goldsbury, Ryan; et al. (2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal , 140 (6): 1830– 1837, arXiv :1008.2755 Bibcode :2010AJ....140.1830G , doi :10.1088/0004-6256/140/6/1830 . 1 2 3 4 Boyles, J.; et al. (2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal , 742 (1): 51, arXiv :1108.4402 Bibcode :2011ApJ...742...51B , doi :10.1088/0004-637X/742/1/51 . 1 2 "SIMBAD Astronomical Database" . Results for NGC 4590 . Diakses tanggal 2006-11-17 .↑ distance × sin( diameter_angle / 2 ) = 53 ly. radius ↑ Sollima, A.; et al. (2008), "The correlation between blue straggler and binary fractions in the core of Galactic globular clusters", Astronomy and Astrophysics , 481 (3): 701– 704, arXiv :0801.4511 Bibcode :2008A& A...481..701S , doi :10.1051/0004-6361:20079082
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