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Sowell, J. R.; Trippe, M.; Caballero-Nieves, S. M.; Houk, N. H-R Diagrams Based on the HD Stars in the Michigan Spectral Catalogue and the Hipparcos Catalog. The Astronomical Journal. 2007, 134 (3): 1089. Bibcode:2007AJ....134.1089S. doi:10.1086/520060.
Sota, A.; Maíz Apellániz, J.; Walborn, N. R.; Alfaro, E. J.; Barbá, R. H.; Morrell, N. I.; Gamen, R. C.; Arias, J. I. The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500. The Astrophysical Journal Supplement. 2011, 193 (2): 24. Bibcode:2011ApJS..193...24S. arXiv:1101.4002. doi:10.1088/0067-0049/193/2/24.
Smartt, S. J.; Lennon, D. J.; Kudritzki, R. P.; Rosales, F.; Ryans, R. S. I.; Wright, N. The evolutionary status of Sher 25 - Implications for blue supergiants and the progenitor of SN 1987A. Astronomy and Astrophysics. 2002, 391 (3): 979. Bibcode:2002A&A...391..979S. arXiv:astro-ph/0205242. doi:10.1051/0004-6361:20020829.
Georgy, C.; Saio, H.; Meynet, G. The puzzle of the CNO abundances of α Cygni variables resolved by the Ledoux criterion. Monthly Notices of the Royal Astronomical Society: Letters. 2013, 439: L6. Bibcode:2014MNRAS.439L...6G. arXiv:1311.4744. doi:10.1093/mnrasl/slt165.
Groh, Jose H.; Georges Meynet; Cyril Georgy; Sylvia Ekstrom. Fundamental properties of core-collapse Supernova and GRB progenitors: Predicting the look of massive stars before death. Astronomy & Astrophysics. 2013, 558: A131. Bibcode:2013A&A...558A.131G. arXiv:1308.4681. doi:10.1051/0004-6361/201321906.
Van Dyk, S. D.; Li, W.; Filippenko, A. V. A Search for Core‐Collapse Supernova Progenitors in Hubble Space Telescope Images. Publications of the Astronomical Society of the Pacific. 2003, 115 (803): 1. Bibcode:2003PASP..115....1V. arXiv:astro-ph/0210347. doi:10.1086/345748.