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.