Erik Dahlstr&#246;m. <a href="http://www.w3.org/TR/2007/WD-SVGFilterReqs12-20070501"><cite>SVG Filter Requirements.</cite></a> 1 May 2007. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2007/WD-SVGFilterReqs12-20070501">http://www.w3.org/TR/2007/WD-SVGFilterReqs12-20070501</a>