@Misc{ 
  BelEls19,
  author = { Bellettini, Giovanni and Elshorbagy, Alaa },
  title = { On the square distance function from a manifold with boundary },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4260/ },
  note = { cvgmt preprint}
}