@Article{Lachaud00a,
  author =       {J.-O. Lachaud and A. Montanvert},
  title =        {{C}ontinuous analogs of digital boundaries: A topological
 	approach to iso-surfaces},
  journal =      "Graphical Models and Image Processing",
  publisher =    {Academic Press},
  year =         {2000},
  volume = 62,
  pages = {129--164},
  keywords= "digital topology, isosurface extraction, marching cubes, digital surface tracking, Jordan-Brouwer theorem, simplicial complexes"
}