Stefania Corsaro Karol Mikula Alessandro Sarti Fiorella Sgallari Semi-Implicit Covolume Method in 3D Image Segmentation. 2248-2265 2006 28 SIAM J. Scientific Computing 6 http://dx.doi.org/10.1137/060651203 db/journals/siamsc/siamsc28.html#CorsaroMSS06