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Benedict, G. Fritz; et al. (January 2002), "Astrometry with the Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator RR Lyrae", The Astronomical Journal, 123 (1): 473–484, arXiv:astro-ph/0110271, Bibcode:2002AJ....123..473B, doi:10.1086/338087
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