@Misc{ 
  AmbBreCon23,
  author = { Ambrosio, Luigi and Brena, Camillo and Conti, Sergio },
  title = { Functions with bounded Hessian-Schatten variation: density, variational
  and extremality properties },
  journal = {  },
  year = { 2023 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5922/ },
  note = { cvgmt preprint}
}