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rotational elements: 2006" Arxivləşdirilib 2017-06-08 at the Wayback Machine. Celestial Mechanics and Dynamical Astronomy. 98 (3): 155–180. Bibcode:2007CeMDA
Regarding The Moon and Other Celestial Bodies (2004)" Arxivləşdirilib 2009-12-22 at the Wayback Machine (PDF). International Institute of Space Law. 2004