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Mark J. Pecaut; Eric E. Mamajek; Eric J. Bubar (Şubat 2012). "A Revised Age for Upper Scorpius and the Star Formation History among the F-type Members of the Scorpius-Centaurus OB Association". Astrophysical Journal. 746 (2): 154. arXiv:1112.1695 $2. Bibcode:2012ApJ...746..154P. doi:10.1088/0004-637X/746/2/154.