Tomohiro Ikai Mika Yoneyama Yasuhiko Dote Novel Intelligent Agent-Based System for Study of Trade. 113-123 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3213&spage=113 2004 conf/kes/2004-1 KES db/conf/kes/kes2004-1.html#IkaiYD04