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Keenan, Philip C. (1987-08), “Spectral types and their uses”, Publications of the Astronomical Society of the Pacific99: 713-723, Bibcode: 1987PASP...99..713K, doi:10.1086/132036
Zhao, G.; Qiu, H. M.; Mao, Shude (2001-04), “High-Resolution Spectroscopic Observations of Hipparcos Red Clump Giants: Metallicity and Mass Determinations”, Astrophysical Journal551 (1): L85-L88, Bibcode: 2001ApJ...551L..85Z, doi:10.1086/319832