Simon, J. L.; Bretagnon, P.; Chapront, J.; Chapront-Touze, M.; Francou, G.; Laskar, J. (February 1994). "Numerical expressions for precession formulae and mean elements for the Moon and the planets". Astronomy and Astrophysics. 282: 663. Bibcode:1994A&A...282..663S.
Vincent, Fiona (August 2005). "A major 'lunar standstill'". Journal of the British Astronomical Association. 115 (4): 220. Bibcode:2005JBAA..115..220V.