@Misc{ 
  AdBoFrPr19,
  author = { Adami, Riccardo and Boscain, Ugo and Franceschi, Valentina and Prandi, Dario },
  title = { Point interactions for 3D sub-Laplacians },
  journal = { Annales IHP C - Analyse Nonlinéaire },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4224/ },
  note = { cvgmt preprint}
}