Deborah L. McGuinness Paulo Pinheiro da Silva Infrastructure for Web Explanations. 113-129 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2870&spage=113 2003 conf/semweb/2003 International Semantic Web Conference db/conf/semweb/iswc2003.html#McGuinnessS03