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3. M. D. Fox and J. R. Goggins , Cevian axes and related curves, Math. Gaz. 91 (March 2007), pp. 2–26.
4. A. F. Beardon , Iteration of rational functions, Springer, New York (1991).
5. S. N. Elaydi , An introduction to difference equations, Springer, New York (1995).