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Mittag, M.; Schröder, K.-P.; Perdelwitz, V.; Jack, D.; Schmitt, J. H. M. M. (January 2023). "Chromospheric activity and photospheric variation of $\alpha$ Ori during the great dimming event in 2020". Astronomy & Astrophysics. 669: A9. arXiv:2211.04967. doi:10.1051/0004-6361/202244924. ISSN0004-6361.
Mittag, M.; Schröder, K.-P.; Perdelwitz, V.; Jack, D.; Schmitt, J. H. M. M. (January 2023). "Chromospheric activity and photospheric variation of $\alpha$ Ori during the great dimming event in 2020". Astronomy & Astrophysics. 669: A9. arXiv:2211.04967. doi:10.1051/0004-6361/202244924. ISSN0004-6361.