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5. Euclid (2007-2008). Elements of Geometry, The Greek text of J.L. Heiberg (1883-1885)from Euclidis Elementa, edidit et Latine interpretatus est I. L. Heiberg, in aedibus B.G. Teubneri, 1883-1885. Edited and provided with a modern English translation by Richard Fitzpatrick. Retrieved from http://farside.ph.utexas.edu/Books/Euclid/Elements.pdf.