Thomas Eiter Volker Klotz Hans Tompits Stefan Woltran Modal Nonmonotonic Logics Revisited: Efficient Encodings for the Basic Reasoning Tasks. 100-114 2002 conf/tableaux/2002 TABLEAUX http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2381&spage=0100 db/conf/tableaux/tableaux2002.html#EiterKTW02