Jonathan Ben-Naim Salem Benferhat Odile Papini Eric Würbel An Answer Set Programming Encoding of Prioritized Removed Sets Revision: Application to GIS. 604-616 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3229&spage=604 2004 conf/jelia/2004 JELIA db/conf/jelia/jelia2004.html#Ben-NaimBPW04