Rashindra Manniesing Wiro J. Niessen Local Speed Functions in Level Set Based Vessel Segmentation. 475-482 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3216&spage=475 2004 conf/miccai/2004-1 MICCAI (1) db/conf/miccai/miccai2004-1.html#ManniesingN04