@Misc{ 
  AmbNicSer22,
  author = { Ambrosio, Luigi and Nicolussi Golo, Sebastiano and Serra Cassano, Francesco },
  title = { Optimal $C^\infty$-approximation of functions with exponentially or  sub-exponentially integrable derivative },
  journal = {  },
  year = { 2022 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5467/ },
  note = { cvgmt preprint}
}