Rolf Haenni Norbert Lehmann ABEL: An Interactive Tool for Probabilistic Argumentative Reasoning. 588-593 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2711&spage=588 2003 conf/ecsqaru/2003 ECSQARU db/conf/ecsqaru/ecsqaru2003.html#HaenniL03