(en) A. Sota, J. Maíz Apellániz, N. R. Walborn, E. J. Alfaro, R. H. Barbá, N. I. Morrell, R. C. Gamen et J. I. Arias, « The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500 », The Astrophysical Journal Supplement, vol. 193, no 2, , p. 24 (DOI10.1088/0067-0049/193/2/24, Bibcode2011ApJS..193...24S, arXiv1101.4002, S2CID119248206).
(en) J. Maíz Apellániz, A. Sota, J. I. Arias, R. H. Barbá, N. R. Walborn, S. Simón-Díaz, I. Negueruela, A. Marco, J. R. S. Leão, A. Herrero, R. C. Gamen et E. J. Alfaro, « The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 Additional O-type Systems », The Astrophysical Journal Supplement Series, vol. 224, no 1, , p. 4 (DOI10.3847/0067-0049/224/1/4, Bibcode2016ApJS..224....4M, arXiv1602.01336, S2CID55658165).
(en) Myron A. Smith, « Nonradial pulsations in the zero-age main-sequence star upsilon Orionis /09.5 V/ », Astrophysical Journal, vol. 248, no 1, , p. 214–21 (DOI10.1086/159145, Bibcode1981ApJ...248..214S).
(en) A. Sota, J. Maíz Apellániz, N. R. Walborn, E. J. Alfaro, R. H. Barbá, N. I. Morrell, R. C. Gamen et J. I. Arias, « The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500 », The Astrophysical Journal Supplement, vol. 193, no 2, , p. 24 (DOI10.1088/0067-0049/193/2/24, Bibcode2011ApJS..193...24S, arXiv1101.4002, S2CID119248206).
(en) J. Maíz Apellániz, A. Sota, J. I. Arias, R. H. Barbá, N. R. Walborn, S. Simón-Díaz, I. Negueruela, A. Marco, J. R. S. Leão, A. Herrero, R. C. Gamen et E. J. Alfaro, « The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 Additional O-type Systems », The Astrophysical Journal Supplement Series, vol. 224, no 1, , p. 4 (DOI10.3847/0067-0049/224/1/4, Bibcode2016ApJS..224....4M, arXiv1602.01336, S2CID55658165).
(en) R. F. Garrison, « Anchor Points for the MK System of Spectral Classification », Bulletin of the American Astronomical Society, vol. 25, , p. 1319 (Bibcode1993AAS...183.1710G, lire en ligne [archive du ], consulté le ).
(en) Myron A. Smith, « Nonradial pulsations in the zero-age main-sequence star upsilon Orionis /09.5 V/ », Astrophysical Journal, vol. 248, no 1, , p. 214–21 (DOI10.1086/159145, Bibcode1981ApJ...248..214S).
(en) A. Sota, J. Maíz Apellániz, N. R. Walborn, E. J. Alfaro, R. H. Barbá, N. I. Morrell, R. C. Gamen et J. I. Arias, « The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500 », The Astrophysical Journal Supplement, vol. 193, no 2, , p. 24 (DOI10.1088/0067-0049/193/2/24, Bibcode2011ApJS..193...24S, arXiv1101.4002, S2CID119248206).
(en) J. Maíz Apellániz, A. Sota, J. I. Arias, R. H. Barbá, N. R. Walborn, S. Simón-Díaz, I. Negueruela, A. Marco, J. R. S. Leão, A. Herrero, R. C. Gamen et E. J. Alfaro, « The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 Additional O-type Systems », The Astrophysical Journal Supplement Series, vol. 224, no 1, , p. 4 (DOI10.3847/0067-0049/224/1/4, Bibcode2016ApJS..224....4M, arXiv1602.01336, S2CID55658165).
(en) A. Sota, J. Maíz Apellániz, N. R. Walborn, E. J. Alfaro, R. H. Barbá, N. I. Morrell, R. C. Gamen et J. I. Arias, « The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500 », The Astrophysical Journal Supplement, vol. 193, no 2, , p. 24 (DOI10.1088/0067-0049/193/2/24, Bibcode2011ApJS..193...24S, arXiv1101.4002, S2CID119248206).
(en) J. Maíz Apellániz, A. Sota, J. I. Arias, R. H. Barbá, N. R. Walborn, S. Simón-Díaz, I. Negueruela, A. Marco, J. R. S. Leão, A. Herrero, R. C. Gamen et E. J. Alfaro, « The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 Additional O-type Systems », The Astrophysical Journal Supplement Series, vol. 224, no 1, , p. 4 (DOI10.3847/0067-0049/224/1/4, Bibcode2016ApJS..224....4M, arXiv1602.01336, S2CID55658165).
(en) R. F. Garrison, « Anchor Points for the MK System of Spectral Classification », Bulletin of the American Astronomical Society, vol. 25, , p. 1319 (Bibcode1993AAS...183.1710G, lire en ligne [archive du ], consulté le ).
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(en) R. F. Garrison, « Anchor Points for the MK System of Spectral Classification », Bulletin of the American Astronomical Society, vol. 25, , p. 1319 (Bibcode1993AAS...183.1710G, lire en ligne [archive du ], consulté le ).