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Arellano Ferro, A.; Giridhar, S.; Rojo Arellano, E. (April 2003). “A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars”. 《Revista Mexicana de Astronomía y Astrofísica》 39: 3–15. arXiv:astro-ph/0210695. Bibcode:2003RMxAA..39....3A.
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Knobel, E. B. (1895년 6월). “Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket”. 《Monthly Notices of the Royal Astronomical Society》 55 (8): 429–438. Bibcode:1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429.