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“An Irregular System of Globular Clusters.” How Old Is the Universe?, by DAVID A. WEINTRAUB, Princeton University Press, PRINCETON; OXFORD, 2011, pp. 191–201, Accessed 9 Aug. 2020.
WEINTRAUB, D. (2011). An Irregular System of Globular Clusters. In How Old Is the Universe? (pp. 191-201). PRINCETON; OXFORD: Princeton University Press. Retrieved August 9, 2020, from
WEINTRAUB, DAVID A. "An Irregular System of Globular Clusters." In How Old Is the Universe?, 191-201. PRINCETON; OXFORD: Princeton University Press, 2011. Accessed August 9, 2020.

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