Planet ksi Aql b In: The Extrasolar Planets Encyclopaedia (englisch)
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Sato et al.: Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ΞΎ Aquilae, and HD 81688; in: Publications of the Astronomical Society of Japan, Bd. 60, Nr. 3, S. 539ff. (2008), bibcode:2008PASJ...60..539S