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3. J. Roberts, Elementary Number Theory: a Problem Oriented Approach (The MIT Press, Boston, 1977)
4. K. Ueno, K. Shiga, S. Morita, A Mathematical Gift, II: The Interplay Between Topology, Functions, Geometry and Algebra (AMS, Providence, 1995)
5. I.M. Yaglom, Geometric Transformations I (MAA, Washington, 1962)