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Nieva, M. -F.; Przybilla, N. (2012-03), “Present-day cosmic abundances. A comprehensive study of nearby early B-type stars and implications for stellar and Galactic evolution and interstellar dust models”, Astronomy & Astrophysics539: A143, Bibcode: 2012A&A...539A.143N, doi:10.1093/mnras/stu1541
Grigsby, James A.; Mulliss, Christopher L.; Baer, Gretchen M. (1996-11), “The Iron Abundance of ι Herculis”, Publications of the Astronomical Society of the Pacific108 (729): 953-961, Bibcode: 1996PASP..108..953G, doi:10.1086/133819
Lyubimkov, Leonid S.; et al. (2002-06), “Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars”, Monthly Notices of the Royal Astronomical Society333 (1): 9-26, Bibcode: 2002MNRAS.333....9L, doi:10.1046/j.1365-8711.2002.05341.x
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