@Article{ 
  CarCorTen18c,
  author = { Carlone, Raffaele and Correggi, Michele and Tentarelli, Lorenzo },
  title = { An introduction to the two-dimensional Schrödinger equation with  nonlinear point interactions },
  journal = { Nanosystems: Phys. Chem. Math. },
  year = { 2018 },
  doi = { 10.17586/2220-8054-2018-9-2-187-195 },
  volume = { 9 },
  number = { 2 },
  pages = { 187-195 },
  URL = { http://cvgmt.sns.it/paper/5646/ },
  note = { cvgmt preprint}
}