J. de Bruijn, H. Lausen, A. Polleres, D. Fensel: The WSML rule languages for the Semantic Web. W3C Workshop on Rule Languages for Interoperability, Washington USA, 27–28 April 2005. http://dip.semanticweb.org/TheWSMLrulelanguagesfortheSemanticWeb.htm Archived 2009-01-07 at the Wayback Machine http://dip.semanticweb.org/TheWSMLrulelanguagesfortheSemanticWeb.htm