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H. C. Chan, in terms of : Some Recent Developments, *Proceedings of the Twelfth International Conference in Fibonacci Numbers*, (2010): 17-25. Read Pi in terms of Phi (Fib Conf 2006).

H. C. Chan, in terms of , *Fibonacci Quart.* **44** (2006): 141–144. Read Pi in terms of phi.

H. C. Chan, More Formulas for , *Amer. Math. Monthly* **113**: 452-455. Read More formulas for Pi.

H. C. Chan, Machin-type formulas expressing in terms of , *Fibonacci Quart.* **46/47** (2008/2009): 32–37 Read Pi via Machin.

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