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Neuhäuser, R.; Torres, G.; Mugrauer, M.; Neuhäuser, D. L.; Chapman, J.; Luge, D.; Cosci, M. (2022), "Colour evolution of Betelgeuse and Antares over two millennia, derived from historical records, as a new constraint on mass and age", Monthly Notices of the Royal Astronomical Society, 516 (1): 693, arXiv:2207.04702, Bibcode:2022MNRAS.516..693N, doi:10.1093/mnras/stac1969
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Neuhäuser, R.; Torres, G.; Mugrauer, M.; Neuhäuser, D. L.; Chapman, J.; Luge, D.; Cosci, M. (2022), "Colour evolution of Betelgeuse and Antares over two millennia, derived from historical records, as a new constraint on mass and age", Monthly Notices of the Royal Astronomical Society, 516 (1): 693, arXiv:2207.04702, Bibcode:2022MNRAS.516..693N, doi:10.1093/mnras/stac1969