Reinhold Letz Lemma and Model Caching in Decision Procedures for Quantified Boolean Formulas. 160-175 2002 conf/tableaux/2002 TABLEAUX http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2381&spage=0160 db/conf/tableaux/tableaux2002.html#Letz02