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- [7] The metal-poor inner spheroid globular cluster NGC 6558 ASTRONOMICAL JOURNAL, 2004, 128 (01): : 300 - 311
- [9] MULTIPLE STELLAR POPULATIONS IN THE GALACTIC GLOBULAR CLUSTER NGC 6752 ASTROPHYSICAL JOURNAL, 2010, 709 (02): : 1183 - 1194
- [10] The age of NGC 6426, a metal-poor globular cluster in the galactic halo ASTRONOMICAL JOURNAL, 1999, 117 (06): : 3059 - 3065