Reinhold Letz Gernot Stenz Integration of Equality Reasoning into the Disconnection Calculus. 176-190 2002 conf/tableaux/2002 TABLEAUX http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2381&spage=0176 db/conf/tableaux/tableaux2002.html#LetzS02