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Sousa, S. G.; et al. (2008). “Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes”. Astronomy and Astrophysics487 (1): 378-381. Bibcode: 2008A&A...487..373S. doi:10.1051/0004-6361:200809698.