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Published online by Cambridge University Press: 03 November 2016
page 461 note * Quarterly Journal of Math. vol. 50, pp. 253-258 (1925), or the author’s Differential Geometry, Arts. 122-124 (C.U.P. Jan. 1927). The differential invariants here employed are all two-parametric.
page 461 note † Proc. Roy. Soc. Edin. vol. 46, part 2, p. 200 (1926).