The quest for PI

@article{Bailey1997TheQF,
  title={The quest for PI},
  author={David H. Bailey and Simon Plouffe and Peter B. Borwein and Jonathan Michael Borwein},
  journal={The Mathematical Intelligencer},
  year={1997},
  volume={19},
  pages={50-56}
}
This article gives a brief history of the analysis and computation of the mathematical constant $\pi = 3.14159 \ldots$, including a number of the formulas that have been used to compute $\pi$ through the ages. Recent developments in this area are then discussed in some detail, including the recent computation of $\pi$ to over six billion decimal digits using high-order convergent algorithms, and a newly discovered scheme that permits arbitrary individual hexadecimal digits of $\pi$ to be… 
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