Source : "Good News, id Tech 5 Is Likely Coming To Linux" by Michael Larabel, www.phoronix.com. September 14, 2009.
Source : Richard J. Leider (2008). “The Power of Purpose: Creating Meaning in Your Life and Work: Easyread Edition”, p.24, ReadHowYouWant.com
Source : W. W. Rouse Ball (2012). “A Short Account of the History of Mathematics”, p.395, Courier Corporation
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