John P. Eakins K. Jonathan Riley Jonathan D. Edwards Shape Feature Matching for Trademark Image Retrieval. 28-38 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2728&spage=28 2003 conf/civr/2003 CIVR db/conf/civr/civr2003.html#EakinsRE03