@Misc{ 
  CaFrKrPr21,
  author = { Cassano, Biagio and Franceschi, Valentina and Krejcirik, David and Prandi, Dario },
  title = { Horizontal magnetic fields and improved Hardy inequalities in the Heisenberg group },
  journal = {  },
  year = { 2021 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5315/ },
  note = { cvgmt preprint}
}