Menzo Windhouwer Roelof van Zwol Combining Concept-with Content-Based Multimedia Retrieval. 217-230 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2818&spage=217 2003 conf/xml/2003 Intelligent Search on XML Data db/conf/xml/xml2003.html#WindhouwerZ03