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2. Kant, Immanuel, Critica de la Razón Pura. Ediciones Colihue, Buenos Aires, argentina, 2007.
3. Stefan Kulczycki, Non-Euclidean Geometry, Dover, 2008.
4. Greenberg, Marvin Jay, Euclidean and non-Euclidean geometries: Development and History, 3rd Ed. 1994.
5. Thomas L. Heath, Euclid the thirteen books of the elements, Dover, 1956.