Mark Davis. <a href="http://www.unicode.org/unicode/reports/tr29/tr29-9.html"><cite>Text Boundaries.</cite></a> 25 March 2005. Unicode Standard Annex #29. URL: <a href="http://www.unicode.org/unicode/reports/tr29/tr29-9.html">http://www.unicode.org/unicode/reports/tr29/tr29-9.html</a>