Nicolas Tsapatsoulis Yannis S. Avrithis Stefanos D. Kollias Facial Image Indexing in Multimedia Databases. 93-107 2001 4 Pattern Anal. Appl. 2-3 http://www.springerlink.com/openurl.asp?genre=article&issn=1433-7541&volume=4&issue=2&spage=93 db/journals/paa/paa4.html#TsapatsoulisAK01