Jerzy Marcinkowski Jan Otop Grzegorz Stelmaszek On a Semantic Subsumption Test. 142-153 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3452&spage=142 2004 conf/lpar/2004 LPAR db/conf/lpar/lpar2004.html#MarcinkowskiOS04