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Holmberg, J.; et al. (November 2007). “The Geneva-Copenhagen survey of the Solar neighbourhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk”. Astronomy and Astrophysics475: 519–537. Bibcode: 2007A&A...475..519H. doi:10.1051/0004-6361:20077221. See the entry for HIP 21770 in the VizieR table with CDS ID V/117A.
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