リファレンス
A.Klebanoff(Ph.D. Univ. California)
Piin the Mndelbrot set (2001)
https://www.researchgate.net/publication/263907735_pi_in_the_Mandelbrot_set
Dr Holly Krieger(Univ. Cambridge Lecture)
Pi and the Mandelbrot Set (2015)
https://www.youtube.com/watch?v=d0vY0CKYhPY&t=330s
Pi and the Mandelbrot Set (2015)
(extra footage)
https://www.youtube.com/watch?v=r8Ksuc7T-VQ