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- [26] BRIGHT MAIN-SEQUENCE STARS IN CLUSTER NGC 7142 SOVIET ASTRONOMY AJ USSR, 1968, 12 (03): : 550 - &
- [27] SOME CHARACTERISTICS OF MODERATELY OLD OPEN CLUSTER NGC 752 ASTROPHYSICAL JOURNAL, 1972, 177 (03): : 653 - &
- [28] UBVRI CCD photometry of the old open cluster NGC 6253 Monthly Notices of the Royal Astronomical Society, 284 (02):
- [29] Resolution infrared spectroscopy of the old open cluster NGC 6791 ASTROPHYSICAL JOURNAL, 2006, 646 (01): : 499 - 504