Hongwei Zhu 0002 Stuart E. Madnick Michael Siegel Reasoning About Temporal Context Using Ontology and Abductive Constraint Logic Programming. 90-101 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3208&spage=90 2004 conf/ppswr/2004 PPSWR db/conf/ppswr/ppswr2004.html#ZhuMS04