Lynden-Bell, D; Lynden-Bell RM (1997). "On the Shapes of Newton's Revolving Orbits". Notes and Records of the Royal Society of London. 51 (2): 195–198. doi:10.1098/rsnr.1997.0016. S2CID73239002.
Hiltebeitel AM (1911). "On the Problem of Two Fixed Centres and Certain of its Generalizations". American Journal of Mathematics. 33 (1/4). The Johns Hopkins University Press: 337–362. doi:10.2307/2369997. JSTOR2369997.
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Hiltebeitel AM (1911). "On the Problem of Two Fixed Centres and Certain of its Generalizations". American Journal of Mathematics. 33 (1/4). The Johns Hopkins University Press: 337–362. doi:10.2307/2369997. JSTOR2369997.
Nemiroff, Robert (13 Jun 2010). "Retrograde Mars". Astronomy Picture of the Day. NASA. Archived from the original on 31 May 2011. Retrieved 31 October 2016.
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Lynden-Bell, D; Lynden-Bell RM (1997). "On the Shapes of Newton's Revolving Orbits". Notes and Records of the Royal Society of London. 51 (2): 195–198. doi:10.1098/rsnr.1997.0016. S2CID73239002.
Nemiroff, Robert (13 Jun 2010). "Retrograde Mars". Astronomy Picture of the Day. NASA. Archived from the original on 31 May 2011. Retrieved 31 October 2016.