Xinghua Fan Maosong Sun Knowledge representation and reasoning based on entity and relation propagation diagram/tree. 81-102 2006 10 Intell. Data Anal. 1 http://iospress.metapress.com/openurl.asp?genre=article&issn=1088-467X&volume=10&issue=1&spage=81 db/journals/ida/ida10.html#FanS06