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Vieira, L. E. A.; Norton, A.; Dudok De Wit, T.; Kretzschmar, M.; Schmidt, G. A.; Cheung, M. C. M. «How the inclination of Earth's orbit affects incoming solar irradiance». Geophysical Research Letters, 39, 16, 2012, pàg. n/a. Bibcode: 2012GeoRL..3916104V. DOI: 10.1029/2012GL052950.
Noerdlinger, Peter D. «Solar Mass Loss, the Astronomical Unit, and the Scale of the Solar System». Celestial Mechanics and Dynamical Astronomy, 801, 2008, pàg. 3807. arXiv: 0801.3807. Bibcode: 2008arXiv0801.3807N.