@Article{ 
  SerTen16,
  author = { Serra, Enrico and Tentarelli, Lorenzo },
  title = { On the lack of bound states for certain NLS equations on metric graphs },
  journal = { Nonlinear Anal. },
  year = { 2016 },
  doi = { 10.1016/j.na.2016.07.008 },
  volume = { 145 },
  pages = { 68-82 },
  URL = { http://cvgmt.sns.it/paper/5621/ },
  note = { cvgmt preprint}
}