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Published online by Cambridge University Press: 15 September 2017
page no 79 note * Ges. Werke, I, p. 223.
page no 79 note † Nouv. Annales de Math. (1862).
page no 79 note ‡ Annals of Mathematics, 20 (1919).
page no 83 note * “The complete quadrilateral“, Annals of Mathematics, 20, 1919.