@Article{krissianPRL05,
  author         = {K. Krissian and C.-F. Westin},                             
  title          = {Fast Sub-Voxel Re-initialization of the Distance Map for   
                   Level Set Methods},                                         
  journal        = {Pattern Recognition Letters},                              
  year           = {2005},                                                     
  volume         = {26},                                                       
  number         = {10},                                                       
  pages          = {1532--1542}
}