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Raassen, A. J. J.; Van Der Hucht, K. A.; Miller, N. A.; Cassinelli, J. P. (2008). “XMM-Newton observations of ζ Orionis (O9.7 Ib): A collisional ionization equilibrium model”. Astronomy and Astrophysics478 (2): 513. Bibcode: 2008A&A...478..513R. doi:10.1051/0004-6361:20077891.
Malkov, O. Y.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). “Dynamical masses of a selected sample of orbital binaries”. Astronomy & Astrophysics546: A69. Bibcode: 2012A&A...546A..69M. doi:10.1051/0004-6361/201219774.