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Gorlova, N.; Lobel, A.; Burgasser, Adam J.; Rieke, G. H.; Ilyin, I.; Stauffer, J. R. (2006). "On the CO Near-Infrared Band and the Line-splitting Phenomenon in the Yellow Hypergiant ρ Cassiopeiae". The Astrophysical Journal. 651 (2): 1130–1150. arXiv:astro-ph/0607158. Bibcode:2006ApJ...651.1130G. doi:10.1086/507590. S2CID15599266.
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Lobel, A.; Dupree, A. K.; Stefanik, R. P.; Torres, G.; Israelian, G.; Morrison, N.; De Jager, C.; Nieuwenhuijzen, H.; Ilyin, I.; Musaev, F. (2003). "High-Resolution Spectroscopy of the Yellow Hypergiant ρ Cassiopeiae from 1993 through the Outburst of 2000–2001". The Astrophysical Journal. 583 (2): 923–954. arXiv:astro-ph/0301238. Bibcode:2003ApJ...583..923L. doi:10.1086/345503. S2CID18587770.