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- [5] PHOTOELECTRIC UBVRI SEQUENCES IN THE REGION OF THE GALACTIC GLOBULAR-CLUSTERS NGC-2808, NGC-4372, AND NGC-6397 ASTRONOMICAL JOURNAL, 1986, 91 (01): : 87 - &
- [10] Chandra LETGS and XMM-Newton observations of NGC 4593 Steenbrugge, K.C. (K.C.Steenbrugge@sron.nl), 1600, EDP Sciences (408):