Miriam Baglioni Franco Turini MQL: An Algebraic Query Language for Knowledge Discovery. 225-236 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2829&spage=225 2003 conf/aiia/2003 AI*IA db/conf/aiia/aiia2003.html#BaglioniT03