Joo-Hwee Lim Building Visual Vocabulary for Image Indexation and Query Formulation. 125-139 2001 4 Pattern Anal. Appl. 2-3 http://www.springerlink.com/openurl.asp?genre=article&issn=1433-7541&volume=4&issue=2&spage=124 db/journals/paa/paa4.html#Lim01