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- [4] Pre-main sequence candidates in the very young open cluster NGC 6611 ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1997, 121 (02): : 223 - 242
- [6] Search for pre-main-sequence stars in the young galactic cluster NGC 6910 ASTRONOMICAL JOURNAL, 2000, 119 (04): : 1848 - 1854