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Humphreys, R. M.; Ney, E. P. (1974-12-15), “Visual and infrared observations of late-type supergiants in the southern sky”, Astrophysical Journal194: 623-628, Bibcode: 1974ApJ...194..623H, doi:10.1086/153282
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Keenan, Philip C.; McNeil, Raymond C. (1989-10), “The Perkins catalog of revised MK types for the cooler stars”, Astrophysical Journal Supplement Series71: 245-266, Bibcode: 1989ApJS...71..245K, doi:10.1086/191373
Pecaut, Mark J.; Mamajek, Eric E.; Bubar, Eric J. (2012-02), “A Revised Age for Upper Scorpius and the Star Formation History among the F-type Members of the Scorpius-Centaurus OB Association”, Astrophysical Journal746 (2): 154, Bibcode: 2012ApJ...746..154P, doi:10.1088/0004-637X/746/2/154