Harald Ganzinger Thomas Hillenbrand Uwe Waldmann Superposition Modulo a Shostak Theory. 182-196 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2741&spage=182 2003 conf/cade/2003 CADE db/conf/cade/cade2003.html#GanzingerHW03