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Harper, Graham M.; Brown, Alexander; Lim, Jeremy (April 2001). «A Spatially Resolved, Semiempirical Model for the Extended Atmosphere of α Orionis (M2 Iab)». The Astrophysical Journal551 (2): 1073–98. Bibcode:2001ApJ...551.1073H. doi:10.1086/320215. CS1 maint: Multiple names: authors list (link)