@Article{ 
  DovTen18,
  author = { Dovetta, Simone and Tentarelli, Lorenzo },
  title = { Ground states of the $L^2$-critical NLS equation with localized  nonlinearity on a tadpole graph },
  journal = { Oper. Theory Adv. Appl. },
  year = { 2020 },
  doi = { 10.1007/978-3-030-44097-8_5 },
  volume = { 281 },
  pages = { 113-125 },
  URL = { http://cvgmt.sns.it/paper/5629/ },
  note = { cvgmt preprint}
}