Emily M. Levesque, Philip Massey, K. A. G. Olsen, Bertrand Plez, Eric Josselin, Andre Maeder, and Georges Meynet. The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2005. — August (vol. 628, no. 2). — P. 973—985. — doi:10.1086/430901. — Bibcode: 2005ApJ...628..973L. — arXiv:astro-ph/0504337. (англ.)
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Y. Asaki, S. Deguchi, H. Imai, K. Hachisuka, M. Miyoshi, and M. Honma. DISTANCE AND PROPER MOTION MEASUREMENT OF THE RED SUPERGIANT, S PERSEI, WITH VLBI H2O MASER ASTROMETRY (нем.) // The Astrophysical Journal : magazin. — IOP Publishing, 2010. — April (Bd. 721, Nr. 1). — S. 721. — doi:10.1088/0004-637X/721/1/267. (англ.)
Emily M. Levesque, Philip Massey, K. A. G. Olsen, Bertrand Plez, Eric Josselin, Andre Maeder, and Georges Meynet. The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2005. — August (vol. 628, no. 2). — P. 973—985. — doi:10.1086/430901. — Bibcode: 2005ApJ...628..973L. — arXiv:astro-ph/0504337. (англ.)
Emily M. Levesque, Philip Massey, K. A. G. Olsen, Bertrand Plez, Eric Josselin, Andre Maeder, and Georges Meynet. The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2005. — August (vol. 628, no. 2). — P. 973—985. — doi:10.1086/430901. — Bibcode: 2005ApJ...628..973L. — arXiv:astro-ph/0504337. (англ.)