Meisters, G. H. (1975), «Polygons have ears», The American Mathematical Monthly, 82: 648–651, MR0367792, doi:10.2307/2319703.
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Heath, Thomas L. (1956). The Thirteen Books of Euclid's Elements. Dover Publications 2nd ed. [Facsimile. Original publication: Cambridge University Press, 1925] ed. New York: [s.n.]
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Meisters, G. H. (1975), «Polygons have ears», The American Mathematical Monthly, 82: 648–651, MR0367792, doi:10.2307/2319703.