Aaron Patterson; Patrick Schmitz; Debbie Newman. <a href="http://www.w3.org/TR/2002/NOTE-XHTMLplusSMIL-20020131"><cite>XHTML+SMIL Profile.</cite></a> 31 January 2002. W3C Note. URL: <a href="http://www.w3.org/TR/2002/NOTE-XHTMLplusSMIL-20020131">http://www.w3.org/TR/2002/NOTE-XHTMLplusSMIL-20020131</a>