@Article{ 
  KolSan21,
  author = { Kolasiński, Sławomir and Santilli, Mario },
  title = { Regularity of distance functions from arbitrary closed sets },
  journal = { Math. Ann. },
  year = { 2023 },
  doi = { https://doi.org/10.1007/s00208-022-02407-7 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5184/ },
  note = { cvgmt preprint}
}