Shin'ichi Matsui; et al. <a href="http://www.w3.org/TR/1999/NOTE-html40-mobile-19990315"><cite>HTML 4.0 Guidelines for Mobile Access.</cite></a> 15 March 1999. W3C Note. URL: <a href="http://www.w3.org/TR/1999/NOTE-html40-mobile-19990315">http://www.w3.org/TR/1999/NOTE-html40-mobile-19990315</a>