Irving Dindoyal Tryphon Lambrou Jing Deng Andrew Todd-Pokropek Level Set Snake Algorithms on the Fetal Heart. 864-867 2007 ISBI http://dx.doi.org/10.1109/ISBI.2007.356989 conf/isbi/2007 db/conf/isbi/isbi2007.html#DindoyalLDT07