Hirano, Teruyuki; et al. Further Observations of the Tilted Planet XO-3: A New Determination of Spin-Orbit Misalignment, and Limits on Differential Rotation. Publications of the Astronomical Society of Japan. 2011, 63 (6): L57–L61. Bibcode:2011PASJ...63L..57H. arXiv:1108.4493.
Hirano, Teruyuki; et al. Further Observations of the Tilted Planet XO-3: A New Determination of Spin-Orbit Misalignment, and Limits on Differential Rotation. Publications of the Astronomical Society of Japan. 2011, 63 (6): L57–L61. Bibcode:2011PASJ...63L..57H. arXiv:1108.4493.