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Searle, S. C.; et al. (2008-04), “Quantitative studies of the optical and UV spectra of Galactic early B supergiants. I. Fundamental parameters”, Astronomy & Astrophysics481 (3): 777-797, Bibcode: 2008A&A...481..777S, doi:10.1051/0004-6361:20077125
Rosendhal, Jeffrey D.; Wegner, Gary (1970-11), “Spectrum Variations in A-Type Supergiants”, Astrophysical Journal162: 547-556, Bibcode: 1970ApJ...162..547R, doi:10.1086/150687
Bolton, C. T.; Rogers, G. Lars (1978-05), “The binary frequency of the OBN and OBC stars”, Astrophysical Journal222: 234-245, Bibcode: 1978ApJ...222..234B, doi:10.1086/156139
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