David Raggett; Emily Candell. <a href="http://www.w3.org/TR/2002/NOTE-mmi-use-cases-20021204"><cite>Multimodal Interaction Use Cases.</cite></a> 4 December 2002. W3C Note. URL: <a href="http://www.w3.org/TR/2002/NOTE-mmi-use-cases-20021204">http://www.w3.org/TR/2002/NOTE-mmi-use-cases-20021204</a>