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WikiPedia: Pi http://www.cecm.sfu.ca/~jborwein/pi-slides.pdf http://www.britannica.com/EBchecked/topic/458986 http://cdbaby.com/cd/hardnphirm http://business.financialpost.com/2011/07/05/googl... http://books.google.com/?id=QwwcmweJCDQC&printsec=... http://books.google.com/books?id=QlbzjN_5pDoC&pg=P... http://www.guinnessworldrecords.com/world-records/... http://keithschofield.com/pi/std.html http://khoahocnet.com/2012/03/08/vo-bien-s%E1%BB%9... http://www.lifeofpimovie.com/