PHOBOS99: vtip je v tom ze "pi is wrong!"?, jak vime z:
Palais, Robert. “ππ Is Wrong!”, The Mathematical Intelligencer, Volume 23, Number 3, 2001, pp. 7–8. Many of the arguments in The Tau Manifesto are based on or are inspired by “ππ Is Wrong!”.
nebo z:
Tau Day | No, really, pi is wrong: The Tau Manifesto by Michael Hartl
http://tauday.com/tau-manifesto