References
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- Castellanos D. The Ubiquitous π Mathematics Magazine 1988 61 148 163 M. Kline, Mathematics Magazine 56 (1983), 307-314.
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- Beckmann P. A History of Pi Springer-Verlag Golem, Boulder 1977 572 125 Isaac Newton discovered the calculus 10 years after Wallis derived this famous result in his Arithmetica Infinitorum. Thus in order to evaluate the area of a quadrant of the unit circle ∫1- Wallis used interpolations and inductive procedures
- Op. cit. p. 128
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