Kerawit Somchaipeng Jon Sporring Sven Kreiborg Peter Johansen Multi-scale Singularity Trees: Soft-Linked Scale-Space Hierarchies. 97-106 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3459&spage=97 2005 conf/scalespace/2005 Scale-Space db/conf/scalespace/scalespace2005.html#SomchaipengSKJ05