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| | Clifford Article Endnotes |
 | | Robert Stawell Ball, "The Distance of Stars," read 11 February 1881, Proceedings of the Royal Institution of Great Britain, 1879-1882, 9: 514-519, on p.519. |
 | | Robert Stawell Ball, "A Dynamical Parable," Nature, 1 September 1887, 36: 424-429; Originally presented as the presidential address to the Physical Section of the British Association, and published in the Reports of the British Association, (Manchester), 1887, 57; Reprinted in Ball, Treatise: 496-509, on pp.508-509. |
 | | Robert Stawell Ball, A Treatise on the Theory of Screws, (Cambridge: Cambridge University Press), on p.519. |
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