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New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars. (January 2009). Bibcode: 2009arXiv0901.3319H.
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Nieva, M. F.; Przybilla, N. (April 2008). “Carbon abundances of early B-type stars in the solar vicinity. Non-LTE line-formation for C II/III/IV and self-consistent atmospheric parameters”. Astronomy and Astrophysics481 (1): 199–216. Bibcode: 2008A&A...481..199N. doi:10.1051/0004-6361:20078203.
Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (July 1969). “MK Spectral Types for Bright Southern OB Stars”. Astrophysical Journal157: 313. Bibcode: 1969ApJ...157..313H. doi:10.1086/150069.