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Introducción to mathematics по Cooley, Hollis R, Wahlert, Howard E

Introduction élémentaire a la géométrie lobatschewskienne по Turc, Albert

The elements of Non-Euclidean Geometry по Sommerville, Duncan M'Laren Young

Noneuclidean Geometry по Meschkowski, Herbert

Geometrical researches on the theory of parallels по Lobachevski, Nicholas

Lectures on Hyperbolic Geometry по Benedetti, Riccardo, Petronio, Carlo

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