Bailey, David H. (8 September 2006). "The BBP Algorithm for Pi"(PDF). Retrieved 17 January 2013. Run times for the BBP algorithm ... increase roughly linearly with the position d.
"PiHex Credits". Centre for Experimental and Constructive Mathematics. Simon Fraser University. March 21, 1999. Archived from the original on 2017-06-10. Retrieved 30 March 2018.
web.archive.org
"PiHex Credits". Centre for Experimental and Constructive Mathematics. Simon Fraser University. March 21, 1999. Archived from the original on 2017-06-10. Retrieved 30 March 2018.