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Deltorn, J.-M.; Kalas, P. (2001). "Search for Nemesis Encounters with Vega, ε Eridani, and Fomalhaut". In Jayawardhana, Ray; Greene, Thomas (eds.). Young Stars Near Earth: Progress and Prospects. ASP Conference Series. Vol. 244. San Francisco: Astronomical Society of the Pacific. p. 227. arXiv:astro-ph/0105284. Bibcode:2001ASPC..244..227D. ISBN1-58381-082-X。