Kerawit Somchaipeng Jon Sporring Sven Kreiborg Peter Johansen Transitions of Multi-scale Singularity Trees. 223-233 2005 conf/dsscv/2005 DSSCV http://dx.doi.org/10.1007/11577812_20 db/conf/dsscv/dsscv2005.html#SomchaipengSKJ05