@Article{GrigorescuPetkovIEEE-TIP2003,
  author =   {C. Grigorescu and N. Petkov},
  title =    {Distance sets for shape filters and shape recognition},
  journal =  {IEEE Trans. Image Processing},
  year =     {2003},
  volume =   {12},
  number =   {10},
  pages =    {1274-1286}
}