@Misc{ 
  FiGuKiSh24a,
  author = { Figalli, Alessio and Guerra, André and Kim, Sunghan and Shahgholian, Henrik },
  title = { Constraint maps: singularities vs free boundaries },
  journal = {  },
  year = { 2024 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6787/ },
  note = { cvgmt preprint}
}