Evan K. Wallace; Christine Golbreich. <a href="http://www.w3.org/TR/2009/REC-owl2-new-features-20091027"><cite>OWL 2 Web Ontology Language:New Features and Rationale.</cite></a> 27 October 2009. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2009/REC-owl2-new-features-20091027">http://www.w3.org/TR/2009/REC-owl2-new-features-20091027</a>