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[2] Davenport, H., Higher arithmetic. An introduction to the theory of numbers, Dover Publ. , New York 1983.

[3] Spinadel, V. W. de, The family of metallic means, Visual Mathematics, 1, No. 3 (1999), http//

[4] Spinadel, V. W. de, From the Golden Mean to Chaos, ISBN 950-43-9329-1, Buenos Aires, 1998.

[5] Pickover, C. A., Mathematics and beauty: Several short classroom experiments, Notices AMS  38 (1991), 192-196.

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