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3. COXETER, H. M. S. Non-Euclidean Geometry. 5ª Ed. Toronto: University of Toronto Press, 1965;
4. RAMSEY, A.; RICHTMYER, R.: An introduction to hyperbolic geometry. Springer, 1985;
5. RYAN, P.: Euclidean and Non-Euclidean Geometry: An Analytic Approach, Cambridge, 1986.