Stefan Bordag Gerhard Heyer Uwe Quasthoff Small Worlds of Concepts and Other Principles of Semantic Search. 10-19 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2877&spage=10 2003 conf/iics/2003 IICS db/conf/iics/iics2003.html#BordagHQ03