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အချက်အလက်များအရ တွင်းနက်တည်ရှိသည်ကိုမူ မတွေ့ရပေ။ Evidence of multiple stellar populations Globular Cluster 47 Tuc. Credit ESO Sequence pans across a
cluster ဖြစ်သည်။ Shapley၊ Harlow; Sawyer၊ Helen B. (August 1927)၊ "A Classification of Globular Clusters"၊ Harvard College Observatory Bulletin (849): 11–14၊
Koleva၊ M.; et al. (April 2008)၊ "Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting"၊ Monthly Notices of the
Bibcode: 2007A&A...474..653V. "VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system" (2002). CDS/ADC Collection of
doi:10.1051/0004-6361:20078357 "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system" (2002). CDS/ADC Collection of