Patrick Ion; David Carlisle; Robert Miner. <a href="http://www.w3.org/TR/2008/WD-MathML3-20081117"><cite>Mathematical Markup Language (MathML) Version 3.0.</cite></a> 17 November 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-MathML3-20081117">http://www.w3.org/TR/2008/WD-MathML3-20081117</a>