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doi.org
dx.doi.org
Bond; Nelan; VandenBerg; Schaefer; Dianne Harmer (13 de febrero de 2013). «HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang». The Astrophysical Journal (arxiv.org) 765 (12): L12. arXiv:1302.3180. doi:10.1088/2041-8205/765/1/L12.