Bart M. ter Haar Romeny Jan-Mark Geusebroek Peter Van Osta Rein van den Boomgaard Jan J. Koenderink Color Differential Structure. 353-361 2001 conf/scalespace/2001 Scale-Space http://link.springer.de/link/service/series/0558/bibs/2106/21060353.htm db/conf/scalespace/scalespace2001.html#RomenyGOBK01